40256397 has 6 divisors (see below), whose sum is σ = 58148142. Its totient is φ = 26837592.

The previous prime is 40256387. The next prime is 40256413. The reversal of 40256397 is 79365204.

40256397 is a `hidden beast` number, since 4 + 0 + 2 + 563 + 97 = 666.

It can be written as a sum of positive squares in only one way, i.e., 24740676 + 15515721 = 4974^2 + 3939^2 .

It is not a de Polignac number, because 40256397 - 2¹⁵ = 40223629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40256317) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2236458 + ... + 2236475.

It is an arithmetic number, because the mean of its divisors is an integer number (9691357).

Almost surely, 2^40256397 is an apocalyptic number.

It is an amenable number.

40256397 is a deficient number, since it is larger than the sum of its proper divisors (17891745).

40256397 is a wasteful number, since it uses less digits than its factorization.

40256397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4472939 (or 4472936 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 40256397 is about 6344.7929044217. The cubic root of 40256397 is about 342.7243547536.

The spelling of 40256397 in words is "forty million, two hundred fifty-six thousand, three hundred ninety-seven".