18722604 has 12 divisors (see below), whose sum is σ = 43686104. Its totient is φ = 6240864.

The previous prime is 18722597. The next prime is 18722611. The reversal of 18722604 is 40622781.

It is an interprime number because it is at equal distance from previous prime (18722597) and next prime (18722611).

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 780097 + ... + 780120.

Almost surely, 2^18722604 is an apocalyptic number.

It is an amenable number.

18722604 is an abundant number, since it is smaller than the sum of its proper divisors (24963500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18722604 is a wasteful number, since it uses less digits than its factorization.

18722604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560224 (or 1560222 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 18722604 is about 4326.9624449491. The cubic root of 18722604 is about 265.5351899193.

It can be divided in two parts, 187 and 22604, that added together give a triangular number (22791 = T₂₁₃).

The spelling of 18722604 in words is "eighteen million, seven hundred twenty-two thousand, six hundred four".