31029140 has 24 divisors (see below), whose sum is σ = 67264512. Its totient is φ = 12011040.

The previous prime is 31029133. The next prime is 31029151. The reversal of 31029140 is 4192013.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24404 + ... + 25643.

It is an arithmetic number, because the mean of its divisors is an integer number (2802688).

Almost surely, 2^31029140 is an apocalyptic number.

It is an amenable number.

31029140 is an abundant number, since it is smaller than the sum of its proper divisors (36235372).

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

31029140 is a wasteful number, since it uses less digits than its factorization.

31029140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50087 (or 50085 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 31029140 is about 5570.3805974098. The cubic root of 31029140 is about 314.2364643410.

The spelling of 31029140 in words is "thirty-one million, twenty-nine thousand, one hundred forty".