30799921 has 4 divisors (see below), whose sum is σ = 32139072. Its totient is φ = 29460772.

The previous prime is 30799919. The next prime is 30799933. The reversal of 30799921 is 12999703.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 30799921 - 2¹ = 30799919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30799721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 669541 + ... + 669586.

It is an arithmetic number, because the mean of its divisors is an integer number (8034768).

Almost surely, 2^30799921 is an apocalyptic number.

It is an amenable number.

30799921 is a deficient number, since it is larger than the sum of its proper divisors (1339151).

30799921 is a wasteful number, since it uses less digits than its factorization.

30799921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339150.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 30799921 is about 5549.7676527941. The cubic root of 30799921 is about 313.4607734455.

The spelling of 30799921 in words is "thirty million, seven hundred ninety-nine thousand, nine hundred twenty-one".