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1240891 = 2115881
BaseRepresentation
bin100101110111100111011
32100001011221
410232330323
5304202031
642332511
713355521
oct4567473
92301157
101240891
11778333
124ba137
13345a72
14244311
15197a11
hex12ef3b

1240891 has 4 divisors (see below), whose sum is σ = 1246984. Its totient is φ = 1234800.

The previous prime is 1240861. The next prime is 1240931. The reversal of 1240891 is 1980421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1980421 = 10918169.

It is a 4-Lehmer number, since φ(1240891) divides (1240891-1)4.

It is a cyclic number.

It is not a de Polignac number, because 1240891 - 25 = 1240859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2730 + ... + 3151.

It is an arithmetic number, because the mean of its divisors is an integer number (311746).

21240891 is an apocalyptic number.

1240891 is a deficient number, since it is larger than the sum of its proper divisors (6093).

1240891 is an equidigital number, since it uses as much as digits as its factorization.

1240891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6092.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1240891 is about 1113.9528715345. The cubic root of 1240891 is about 107.4594330438.

The spelling of 1240891 in words is "one million, two hundred forty thousand, eight hundred ninety-one".

Divisors: 1 211 5881 1240891