40256685 has 36 divisors (see below), whose sum is σ = 81175068. Its totient is φ = 18402048.

The previous prime is 40256677. The next prime is 40256701. The reversal of 40256685 is 58665204.

It can be written as a sum of positive squares in 2 ways, for example, as 13351716 + 26904969 = 3654^2 + 5187^2 .

It is not a de Polignac number, because 40256685 - 2³ = 40256677 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6924 + ... + 11333.

It is an arithmetic number, because the mean of its divisors is an integer number (2254863).

Almost surely, 2^40256685 is an apocalyptic number.

40256685 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40256685 is an abundant number, since it is smaller than the sum of its proper divisors (40918383).

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

40256685 is a wasteful number, since it uses less digits than its factorization.

40256685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18282 (or 18272 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 40256685 is about 6344.8156001573. The cubic root of 40256685 is about 342.7251720513.

The spelling of 40256685 in words is "forty million, two hundred fifty-six thousand, six hundred eighty-five".