30421979 has 4 divisors (see below), whose sum is σ = 34767984. Its totient is φ = 26075976.

The previous prime is 30421969. The next prime is 30421987. The reversal of 30421979 is 97912403.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97912403 = 23 ⋅4257061.

It is a cyclic number.

It is not a de Polignac number, because 30421979 - 2⁸ = 30421723 is a prime.

It is a super-3 number, since 3×30421979³ (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 (30421949) 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, 2172992 + ... + 2173005.

It is an arithmetic number, because the mean of its divisors is an integer number (8691996).

Almost surely, 2^30421979 is an apocalyptic number.

30421979 is a deficient number, since it is larger than the sum of its proper divisors (4346005).

30421979 is an equidigital number, since it uses as much as digits as its factorization.

30421979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4346004.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 30421979 is about 5515.6122960194. The cubic root of 30421979 is about 312.1733469920.

The spelling of 30421979 in words is "thirty million, four hundred twenty-one thousand, nine hundred seventy-nine".