18349057 has 4 divisors (see below), whose sum is σ = 18357696. Its totient is φ = 18340420.

The previous prime is 18349049. The next prime is 18349063. The reversal of 18349057 is 75094381.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 75094381 = 3121 ⋅24061.

It is a cyclic number.

It is not a de Polignac number, because 18349057 - 2³ = 18349049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18349157) 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, 1332 + ... + 6202.

It is an arithmetic number, because the mean of its divisors is an integer number (4589424).

Almost surely, 2^18349057 is an apocalyptic number.

It is an amenable number.

18349057 is a deficient number, since it is larger than the sum of its proper divisors (8639).

18349057 is an equidigital number, since it uses as much as digits as its factorization.

18349057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8638.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 18349057 is about 4283.5799280508. The cubic root of 18349057 is about 263.7573575959.

The spelling of 18349057 in words is "eighteen million, three hundred forty-nine thousand, fifty-seven".