31100040 has 48 divisors (see below), whose sum is σ = 101076300. Its totient is φ = 8293248.

The previous prime is 31100039. The next prime is 31100063. The reversal of 31100040 is 4000113.

It can be written as a sum of positive squares in 2 ways, for example, as 27436644 + 3663396 = 5238^2 + 1914^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 31099995 and 31100031.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 42835 + ... + 43554.

Almost surely, 2^31100040 is an apocalyptic number.

31100040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31100040 is an abundant number, since it is smaller than the sum of its proper divisors (69976260).

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

31100040 is a wasteful number, since it uses less digits than its factorization.

31100040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86406 (or 86399 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 31100040 is about 5576.7409837646. The cubic root of 31100040 is about 314.4756203704.

Adding to 31100040 its reverse (4000113), we get a palindrome (35100153).

The spelling of 31100040 in words is "thirty-one million, one hundred thousand, forty".