30539821 has 12 divisors (see below), whose sum is σ = 34813920. Its totient is φ = 26704080.

The previous prime is 30539807. The next prime is 30539851. The reversal of 30539821 is 12893503.

It is a happy number.

It is not a de Polignac number, because 30539821 - 2⁷ = 30539693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30539851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1545 + ... + 7966.

It is an arithmetic number, because the mean of its divisors is an integer number (2901160).

Almost surely, 2^30539821 is an apocalyptic number.

It is an amenable number.

30539821 is a deficient number, since it is larger than the sum of its proper divisors (4274099).

30539821 is a wasteful number, since it uses less digits than its factorization.

30539821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9556 (or 9543 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 30539821 is about 5526.2845565533. The cubic root of 30539821 is about 312.5759039087.

The spelling of 30539821 in words is "thirty million, five hundred thirty-nine thousand, eight hundred twenty-one".