40687831 has 4 divisors (see below), whose sum is σ = 40766152. Its totient is φ = 40609512.

The previous prime is 40687771. The next prime is 40687859. The reversal of 40687831 is 13878604.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40687831 - 2¹⁵ = 40655063 is a prime.

It is a super-2 number, since 2×40687831² = 3310999182969122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40687891) 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, 38376 + ... + 39421.

It is an arithmetic number, because the mean of its divisors is an integer number (10191538).

Almost surely, 2^40687831 is an apocalyptic number.

40687831 is a deficient number, since it is larger than the sum of its proper divisors (78321).

40687831 is an equidigital number, since it uses as much as digits as its factorization.

40687831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78320.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 40687831 is about 6378.7013568594. The cubic root of 40687831 is about 343.9443499982.

The spelling of 40687831 in words is "forty million, six hundred eighty-seven thousand, eight hundred thirty-one".