31550742 has 32 divisors (see below), whose sum is σ = 74239200. Its totient is φ = 9897984.

The previous prime is 31550731. The next prime is 31550747. The reversal of 31550742 is 24705513.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31550747) 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 15 ways as a sum of consecutive naturals, for example, 16267 + ... + 18102.

It is an arithmetic number, because the mean of its divisors is an integer number (2319975).

Almost surely, 2^31550742 is an apocalyptic number.

31550742 is an abundant number, since it is smaller than the sum of its proper divisors (42688458).

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

31550742 is a wasteful number, since it uses less digits than its factorization.

31550742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34397 (or 34391 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 31550742 is about 5617.0047178189. The cubic root of 31550742 is about 315.9874681245.

The spelling of 31550742 in words is "thirty-one million, five hundred fifty thousand, seven hundred forty-two".