18983970 has 80 divisors (see below), whose sum is σ = 53317440. Its totient is φ = 4837536.

The previous prime is 18983963. The next prime is 18983971. The reversal of 18983970 is 7938981.

It is a super-2 number, since 2×18983970² = 720782233921800, which contains 22 as substring.

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 (18983971) 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, 18121 + ... + 19139.

It is an arithmetic number, because the mean of its divisors is an integer number (666468).

Almost surely, 2^18983970 is an apocalyptic number.

18983970 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 18983970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26658720).

18983970 is an abundant number, since it is smaller than the sum of its proper divisors (34333470).

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

18983970 is a wasteful number, since it uses less digits than its factorization.

18983970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061 (or 1052 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 18983970 is about 4357.0597884353. The cubic root of 18983970 is about 266.7651008135.

The spelling of 18983970 in words is "eighteen million, nine hundred eighty-three thousand, nine hundred seventy".