30400457 has 4 divisors (see below), whose sum is σ = 31722240. Its totient is φ = 29078676.

The previous prime is 30400453. The next prime is 30400459. The reversal of 30400457 is 75400403.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 30400457 - 2² = 30400453 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 1321759 = 30400457 / (3 + 0 + 4 + 0 + 0 + 4 + 5 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30400451) 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, 660857 + ... + 660902.

It is an arithmetic number, because the mean of its divisors is an integer number (7930560).

Almost surely, 2^30400457 is an apocalyptic number.

It is an amenable number.

30400457 is a deficient number, since it is larger than the sum of its proper divisors (1321783).

30400457 is a wasteful number, since it uses less digits than its factorization.

30400457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321782.

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 30400457 is about 5513.6609435111. The cubic root of 30400457 is about 312.0997140466.

The spelling of 30400457 in words is "thirty million, four hundred thousand, four hundred fifty-seven".