18997470 has 64 divisors (see below), whose sum is σ = 51425280. Its totient is φ = 4989600.

The previous prime is 18997453. The next prime is 18997481. The reversal of 18997470 is 7479981.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18675 + ... + 19665.

It is an arithmetic number, because the mean of its divisors is an integer number (803520).

Almost surely, 2^18997470 is an apocalyptic number.

18997470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18997470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25712640).

18997470 is an abundant number, since it is smaller than the sum of its proper divisors (32427810).

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

18997470 is a wasteful number, since it uses less digits than its factorization.

18997470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078 (or 1072 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 18997470 is about 4358.6087229757. The cubic root of 18997470 is about 266.8283203883.

The spelling of 18997470 in words is "eighteen million, nine hundred ninety-seven thousand, four hundred seventy".