256402437 has 8 divisors (see below), whose sum is σ = 349143936. Its totient is φ = 167297952.

The previous prime is 256402403. The next prime is 256402453. The reversal of 256402437 is 734204652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256402437 - 2⁶ = 256402373 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256402398 and 256402407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256402477) 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, 909088 + ... + 909369.

It is an arithmetic number, because the mean of its divisors is an integer number (43642992).

Almost surely, 2^256402437 is an apocalyptic number.

It is an amenable number.

256402437 is a deficient number, since it is larger than the sum of its proper divisors (92741499).

256402437 is a wasteful number, since it uses less digits than its factorization.

256402437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818507.

The product of its (nonzero) digits is 40320, while the sum is 33.

The square root of 256402437 is about 16012.5712176402. The cubic root of 256402437 is about 635.2929699845.

The spelling of 256402437 in words is "two hundred fifty-six million, four hundred two thousand, four hundred thirty-seven".