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1391946 = 231391669
BaseRepresentation
bin101010011110101001010
32121201101120
411103311022
5324020241
645500110
714555103
oct5236512
92551346
101391946
11870876
12571636
1339974a
142833aa
151c7666
hex153d4a

1391946 has 16 divisors (see below), whose sum is σ = 2805600. Its totient is φ = 460368.

The previous prime is 1391941. The next prime is 1391969. The reversal of 1391946 is 6491931.

1391946 is a nontrivial binomial coefficient, being equal to C(1669, 2).

It is not an unprimeable number, because it can be changed into a prime (1391941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1 + ... + 1668.

It is an arithmetic number, because the mean of its divisors is an integer number (175350).

21391946 is an apocalyptic number.

1391946 is the 1668-th triangular number.

1391946 is an abundant number, since it is smaller than the sum of its proper divisors (1413654).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1391946 is a wasteful number, since it uses less digits than its factorization.

1391946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1813.

The product of its digits is 5832, while the sum is 33.

The square root of 1391946 is about 1179.8076114350. The cubic root of 1391946 is about 111.6539595946.

The spelling of 1391946 in words is "one million, three hundred ninety-one thousand, nine hundred forty-six".

Divisors: 1 2 3 6 139 278 417 834 1669 3338 5007 10014 231991 463982 695973 1391946