18974505 has 16 divisors (see below), whose sum is σ = 33119424. Its totient is φ = 9199680.

The previous prime is 18974491. The next prime is 18974507. The reversal of 18974505 is 50547981.

18974505 = T₈₀₃ + T₈₀₄ + ... + T₈₅₇.

It is not a de Polignac number, because 18974505 - 2⁴ = 18974489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18974507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57334 + ... + 57663.

It is an arithmetic number, because the mean of its divisors is an integer number (2069964).

Almost surely, 2^18974505 is an apocalyptic number.

18974505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18974505 is a deficient number, since it is larger than the sum of its proper divisors (14144919).

18974505 is a wasteful number, since it uses less digits than its factorization.

18974505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115016.

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 18974505 is about 4355.9734847678. The cubic root of 18974505 is about 266.7207589921.

The spelling of 18974505 in words is "eighteen million, nine hundred seventy-four thousand, five hundred five".