18497970 has 80 divisors (see below), whose sum is σ = 51043608. Its totient is φ = 4803840.

The previous prime is 18497939. The next prime is 18497977. The reversal of 18497970 is 7979481.

It can be written as a sum of positive squares in 4 ways, for example, as 5602689 + 12895281 = 2367^2 + 3591^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18497977) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 32932 + ... + 33488.

Almost surely, 2^18497970 is an apocalyptic number.

18497970 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 18497970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25521804).

18497970 is an abundant number, since it is smaller than the sum of its proper divisors (32545638).

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

18497970 is a wasteful number, since it uses less digits than its factorization.

18497970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617 (or 608 counting only the distinct ones).

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

The square root of 18497970 is about 4300.9266443407. The cubic root of 18497970 is about 264.4689495582.

The spelling of 18497970 in words is "eighteen million, four hundred ninety-seven thousand, nine hundred seventy".