31252540 has 24 divisors (see below), whose sum is σ = 71597232. Its totient is φ = 11364480.

The previous prime is 31252513. The next prime is 31252583. The reversal of 31252540 is 4525213.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

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, 70809 + ... + 71248.

It is an arithmetic number, because the mean of its divisors is an integer number (2983218).

Almost surely, 2^31252540 is an apocalyptic number.

It is an amenable number.

31252540 is an abundant number, since it is smaller than the sum of its proper divisors (40344692).

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

31252540 is a wasteful number, since it uses less digits than its factorization.

31252540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142077 (or 142075 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 31252540 is about 5590.3971236398. The cubic root of 31252540 is about 314.9887961078.

Adding to 31252540 its reverse (4525213), we get a palindrome (35777753).

It can be divided in two parts, 3125 and 2540, that added together give a palindrome (5665).

The spelling of 31252540 in words is "thirty-one million, two hundred fifty-two thousand, five hundred forty".