30879949 has 4 divisors (see below), whose sum is σ = 31303036. Its totient is φ = 30456864.

The previous prime is 30879943. The next prime is 30879971. The reversal of 30879949 is 94997803.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94997803 = 1217 ⋅78059.

It can be written as a sum of positive squares in 2 ways, for example, as 10692900 + 20187049 = 3270^2 + 4493^2 .

It is a cyclic number.

It is not a de Polignac number, because 30879949 - 2⁵ = 30879917 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 (30879943) 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, 211434 + ... + 211579.

It is an arithmetic number, because the mean of its divisors is an integer number (7825759).

Almost surely, 2^30879949 is an apocalyptic number.

It is an amenable number.

30879949 is a deficient number, since it is larger than the sum of its proper divisors (423087).

30879949 is an equidigital number, since it uses as much as digits as its factorization.

30879949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423086.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 30879949 is about 5556.9730069526. The cubic root of 30879949 is about 313.7320289384.

The spelling of 30879949 in words is "thirty million, eight hundred seventy-nine thousand, nine hundred forty-nine".