18995940 has 36 divisors (see below), whose sum is σ = 57621564. Its totient is φ = 5065536.

The previous prime is 18995939. The next prime is 18995947. The reversal of 18995940 is 4959981.

It can be written as a sum of positive squares in 2 ways, for example, as 13003236 + 5992704 = 3606^2 + 2448^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 (18995947) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52587 + ... + 52946.

It is an arithmetic number, because the mean of its divisors is an integer number (1600599).

Almost surely, 2^18995940 is an apocalyptic number.

18995940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18995940 is an abundant number, since it is smaller than the sum of its proper divisors (38625624).

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

18995940 is a wasteful number, since it uses less digits than its factorization.

18995940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105548 (or 105543 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 18995940 is about 4358.4332047193. The cubic root of 18995940 is about 266.8211570082.

The spelling of 18995940 in words is "eighteen million, nine hundred ninety-five thousand, nine hundred forty".