30732981 has 8 divisors (see below), whose sum is σ = 41130720. Its totient is φ = 20411952.

The previous prime is 30732973. The next prime is 30732983. The reversal of 30732981 is 18923703.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 30732981 - 2³ = 30732973 is a prime.

It is a super-2 number, since 2×30732981² = 1889032242292722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30732983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18235 + ... + 19848.

It is an arithmetic number, because the mean of its divisors is an integer number (5141340).

Almost surely, 2^30732981 is an apocalyptic number.

It is an amenable number.

30732981 is a deficient number, since it is larger than the sum of its proper divisors (10397739).

30732981 is a wasteful number, since it uses less digits than its factorization.

30732981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38355.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 30732981 is about 5543.7334892652. The cubic root of 30732981 is about 313.2335187072.

It can be divided in two parts, 30732 and 981, that added together give a palindrome (31713).

The spelling of 30732981 in words is "thirty million, seven hundred thirty-two thousand, nine hundred eighty-one".