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1391931 = 33311663
BaseRepresentation
bin101010011110100111011
32121201101000
411103310323
5324020211
645500043
714555052
oct5236473
92551330
101391931
11870862
12571623
13399738
14283399
151c7656
hex153d3b

1391931 has 16 divisors (see below), whose sum is σ = 2129920. Its totient is φ = 897480.

The previous prime is 1391927. The next prime is 1391933.

1391931 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1391931 - 22 = 1391927 is a prime.

It is a super-2 number, since 2×13919312 = 3874943817522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1391895 and 1391904.

It is not an unprimeable number, because it can be changed into a prime (1391933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6 + ... + 1668.

It is an arithmetic number, because the mean of its divisors is an integer number (133120).

21391931 is an apocalyptic number.

1391931 is a deficient number, since it is larger than the sum of its proper divisors (737989).

1391931 is a wasteful number, since it uses less digits than its factorization.

1391931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1703 (or 1697 counting only the distinct ones).

The product of its digits is 729, while the sum is 27.

The square root of 1391931 is about 1179.8012544492. The cubic root of 1391931 is about 111.6535585217.

The spelling of 1391931 in words is "one million, three hundred ninety-one thousand, nine hundred thirty-one".

Divisors: 1 3 9 27 31 93 279 837 1663 4989 14967 44901 51553 154659 463977 1391931