40638631 has 8 divisors (see below), whose sum is σ = 46260864. Its totient is φ = 35337720.

The previous prime is 40638629. The next prime is 40638673. The reversal of 40638631 is 13683604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40638631 - 2¹ = 40638629 is a prime.

It is a super-2 number, since 2×40638631² = 3302996659108322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40638593 and 40638602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40638601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80061 + ... + 80566.

It is an arithmetic number, because the mean of its divisors is an integer number (5782608).

Almost surely, 2^40638631 is an apocalyptic number.

40638631 is a deficient number, since it is larger than the sum of its proper divisors (5622233).

40638631 is a wasteful number, since it uses less digits than its factorization.

40638631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160661.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 40638631 is about 6374.8436059248. The cubic root of 40638631 is about 343.8056608050.

The spelling of 40638631 in words is "forty million, six hundred thirty-eight thousand, six hundred thirty-one".