30971990 has 16 divisors (see below), whose sum is σ = 63713952. Its totient is φ = 10618944.

The previous prime is 30971989. The next prime is 30972041. The reversal of 30971990 is 9917903.

It is a happy number.

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, 221159 + ... + 221298.

It is an arithmetic number, because the mean of its divisors is an integer number (3982122).

Almost surely, 2^30971990 is an apocalyptic number.

30971990 is an abundant number, since it is smaller than the sum of its proper divisors (32741962).

30971990 is a wasteful number, since it uses less digits than its factorization.

30971990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442471.

The product of its (nonzero) digits is 15309, while the sum is 38.

The square root of 30971990 is about 5565.2484221282. The cubic root of 30971990 is about 314.0434237483.

The spelling of 30971990 in words is "thirty million, nine hundred seventy-one thousand, nine hundred ninety".