31814040 has 32 divisors (see below), whose sum is σ = 95442480. Its totient is φ = 8483712.

The previous prime is 31814017. The next prime is 31814047. The reversal of 31814040 is 4041813.

It is a super-2 number, since 2×31814040² = 2024266282243200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31813998 and 31814016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31814047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132439 + ... + 132678.

Almost surely, 2^31814040 is an apocalyptic number.

31814040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31814040 is an abundant number, since it is smaller than the sum of its proper divisors (63628440).

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

31814040 is a wasteful number, since it uses less digits than its factorization.

31814040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265131 (or 265127 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 31814040 is about 5640.3936032869. The cubic root of 31814040 is about 316.8640296300.

Adding to 31814040 its reverse (4041813), we get a palindrome (35855853).

The spelling of 31814040 in words is "thirty-one million, eight hundred fourteen thousand, forty".