30769921 has 16 divisors (see below), whose sum is σ = 38102400. Its totient is φ = 24196608.

The previous prime is 30769867. The next prime is 30769931. The reversal of 30769921 is 12996703.

It is a cyclic number.

It is not a de Polignac number, because 30769921 - 2⁷ = 30769793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30769931) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15345 + ... + 17233.

It is an arithmetic number, because the mean of its divisors is an integer number (2381400).

Almost surely, 2^30769921 is an apocalyptic number.

It is an amenable number.

30769921 is a deficient number, since it is larger than the sum of its proper divisors (7332479).

30769921 is a wasteful number, since it uses less digits than its factorization.

30769921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2088.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 30769921 is about 5547.0641784641. The cubic root of 30769921 is about 313.3589671448.

It can be divided in two parts, 307699 and 21, that added together give a triangular number (307720 = T₇₈₄).

The spelling of 30769921 in words is "thirty million, seven hundred sixty-nine thousand, nine hundred twenty-one".