256240542 has 8 divisors (see below), whose sum is σ = 512481096. Its totient is φ = 85413512.

The previous prime is 256240519. The next prime is 256240547. The reversal of 256240542 is 245042652.

It is a happy number.

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

256240542 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256240547) 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, 21353373 + ... + 21353384.

It is an arithmetic number, because the mean of its divisors is an integer number (64060137).

Almost surely, 2^256240542 is an apocalyptic number.

256240542 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

256240542 is a wasteful number, since it uses less digits than its factorization.

256240542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42706762.

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 256240542 is about 16007.5151725682. The cubic root of 256240542 is about 635.1592317731.

The spelling of 256240542 in words is "two hundred fifty-six million, two hundred forty thousand, five hundred forty-two".