40398256 has 40 divisors (see below), whose sum is σ = 87248880. Its totient is φ = 18008064.

The previous prime is 40398233. The next prime is 40398263. The reversal of 40398256 is 65289304.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1260 + ... + 9076.

It is an arithmetic number, because the mean of its divisors is an integer number (2181222).

Almost surely, 2^40398256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40398256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43624440).

40398256 is an abundant number, since it is smaller than the sum of its proper divisors (46850624).

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

40398256 is a wasteful number, since it uses less digits than its factorization.

40398256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7861 (or 7855 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 40398256 is about 6355.9622402906. The cubic root of 40398256 is about 343.1264567850.

The spelling of 40398256 in words is "forty million, three hundred ninety-eight thousand, two hundred fifty-six".