18995380 has 24 divisors (see below), whose sum is σ = 40374432. Its totient is φ = 7505952.

The previous prime is 18995369. The next prime is 18995381. The reversal of 18995380 is 8359981.

It is a super-2 number, since 2×18995380² = 721648922688800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18995381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4062 + ... + 7381.

It is an arithmetic number, because the mean of its divisors is an integer number (1682268).

Almost surely, 2^18995380 is an apocalyptic number.

18995380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18995380 is an abundant number, since it is smaller than the sum of its proper divisors (21379052).

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

18995380 is a wasteful number, since it uses less digits than its factorization.

18995380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11535 (or 11533 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 18995380 is about 4358.3689609761. The cubic root of 18995380 is about 266.8185350214.

It can be divided in two parts, 18995 and 380, that multiplied together give a triangular number (7218100 = T₃₇₉₉).

The spelling of 18995380 in words is "eighteen million, nine hundred ninety-five thousand, three hundred eighty".