18974557 has 8 divisors (see below), whose sum is σ = 21896576. Its totient is φ = 16105392.

The previous prime is 18974551. The next prime is 18974561. The reversal of 18974557 is 75547981.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18974557 - 2¹⁵ = 18941789 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 (18974551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12438 + ... + 13879.

It is an arithmetic number, because the mean of its divisors is an integer number (2737072).

Almost surely, 2^18974557 is an apocalyptic number.

It is an amenable number.

18974557 is a deficient number, since it is larger than the sum of its proper divisors (2922019).

18974557 is a wasteful number, since it uses less digits than its factorization.

18974557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26427.

The product of its digits is 352800, while the sum is 46.

The square root of 18974557 is about 4355.9794535787. The cubic root of 18974557 is about 266.7210026430.

The spelling of 18974557 in words is "eighteen million, nine hundred seventy-four thousand, five hundred fifty-seven".