40387631 has 4 divisors (see below), whose sum is σ = 42763392. Its totient is φ = 38011872.

The previous prime is 40387601. The next prime is 40387649. The reversal of 40387631 is 13678304.

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 40387631 - 2¹⁰ = 40386607 is a prime.

It is a super-2 number, since 2×40387631² = 3262321475584322, 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 (40387601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1187855 + ... + 1187888.

It is an arithmetic number, because the mean of its divisors is an integer number (10690848).

Almost surely, 2^40387631 is an apocalyptic number.

40387631 is a deficient number, since it is larger than the sum of its proper divisors (2375761).

40387631 is a wasteful number, since it uses less digits than its factorization.

40387631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2375760.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 40387631 is about 6355.1263559429. The cubic root of 40387631 is about 343.0963726624.

The spelling of 40387631 in words is "forty million, three hundred eighty-seven thousand, six hundred thirty-one".