30478957 has 2 divisors, whose sum is σ = 30478958. Its totient is φ = 30478956.

The previous prime is 30478939. The next prime is 30478961. The reversal of 30478957 is 75987403.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24098281 + 6380676 = 4909^2 + 2526^2 .

It is a cyclic number.

It is not a de Polignac number, because 30478957 - 2¹⁹ = 29954669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30478927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15239478 + 15239479.

It is an arithmetic number, because the mean of its divisors is an integer number (15239479).

Almost surely, 2^30478957 is an apocalyptic number.

It is an amenable number.

30478957 is a deficient number, since it is larger than the sum of its proper divisors (1).

30478957 is an equidigital number, since it uses as much as digits as its factorization.

30478957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 43.

The square root of 30478957 is about 5520.7750361702. The cubic root of 30478957 is about 312.3681175770.

The spelling of 30478957 in words is "thirty million, four hundred seventy-eight thousand, nine hundred fifty-seven".