31530040 has 32 divisors (see below), whose sum is σ = 71804880. Its totient is φ = 12458752.

The previous prime is 31530029. The next prime is 31530043. The reversal of 31530040 is 4003513.

It is a junction number, because it is equal to n+sod(n) for n = 31529996 and 31530023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31530043) 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 7 ways as a sum of consecutive naturals, for example, 1429 + ... + 8068.

Almost surely, 2^31530040 is an apocalyptic number.

It is an amenable number.

31530040 is an abundant number, since it is smaller than the sum of its proper divisors (40274840).

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

31530040 is a wasteful number, since it uses less digits than its factorization.

31530040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9591 (or 9587 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 31530040 is about 5615.1616183330. The cubic root of 31530040 is about 315.9183413420.

Adding to 31530040 its reverse (4003513), we get a palindrome (35533553).

The spelling of 31530040 in words is "thirty-one million, five hundred thirty thousand, forty".