18953940 has 24 divisors (see below), whose sum is σ = 53071200. Its totient is φ = 5054368.

The previous prime is 18953923. The next prime is 18953941. The reversal of 18953940 is 4935981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18953941) 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, 157890 + ... + 158009.

It is an arithmetic number, because the mean of its divisors is an integer number (2211300).

Almost surely, 2^18953940 is an apocalyptic number.

18953940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18953940 is an abundant number, since it is smaller than the sum of its proper divisors (34117260).

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

18953940 is a wasteful number, since it uses less digits than its factorization.

18953940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315911 (or 315909 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 18953940 is about 4353.6122932572. The cubic root of 18953940 is about 266.6243648177.

The spelling of 18953940 in words is "eighteen million, nine hundred fifty-three thousand, nine hundred forty".