30721974 has 32 divisors (see below), whose sum is σ = 67495680. Its totient is φ = 9279072.

The previous prime is 30721969. The next prime is 30721987. The reversal of 30721974 is 47912703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3237 + ... + 8480.

It is an arithmetic number, because the mean of its divisors is an integer number (2109240).

Almost surely, 2^30721974 is an apocalyptic number.

30721974 is an abundant number, since it is smaller than the sum of its proper divisors (36773706).

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

30721974 is a wasteful number, since it uses less digits than its factorization.

30721974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11764.

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 30721974 is about 5542.7406578335. The cubic root of 30721974 is about 313.1961194387.

The spelling of 30721974 in words is "thirty million, seven hundred twenty-one thousand, nine hundred seventy-four".