256431542 has 8 divisors (see below), whose sum is σ = 387676416. Its totient is φ = 127206072.

The previous prime is 256431541. The next prime is 256431557. The reversal of 256431542 is 245134652.

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

It is a junction number, because it is equal to n+sod(n) for n = 256431499 and 256431508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256431541) 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, 504533 + ... + 505040.

It is an arithmetic number, because the mean of its divisors is an integer number (48459552).

Almost surely, 2^256431542 is an apocalyptic number.

256431542 is a deficient number, since it is larger than the sum of its proper divisors (131244874).

256431542 is a wasteful number, since it uses less digits than its factorization.

256431542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009702.

The product of its digits is 28800, while the sum is 32.

The square root of 256431542 is about 16013.4800090424. The cubic root of 256431542 is about 635.3170070705.

The spelling of 256431542 in words is "two hundred fifty-six million, four hundred thirty-one thousand, five hundred forty-two".