30405979 has 6 divisors (see below), whose sum is σ = 32300084. Its totient is φ = 28617120.

The previous prime is 30405943. The next prime is 30406001. The reversal of 30405979 is 97950403.

It is not a de Polignac number, because 30405979 - 2¹¹ = 30403931 is a prime.

It is a super-3 number, since 3×30405979³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30405779) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52317 + ... + 52894.

Almost surely, 2^30405979 is an apocalyptic number.

30405979 is a deficient number, since it is larger than the sum of its proper divisors (1894105).

30405979 is a wasteful number, since it uses less digits than its factorization.

30405979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105245 (or 105228 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 30405979 is about 5514.1616769913. The cubic root of 30405979 is about 312.1186097087.

The spelling of 30405979 in words is "thirty million, four hundred five thousand, nine hundred seventy-nine".