18951140 has 24 divisors (see below), whose sum is σ = 42859320. Its totient is φ = 6997248.

The previous prime is 18951133. The next prime is 18951167. The reversal of 18951140 is 4115981.

It can be written as a sum of positive squares in 4 ways, for example, as 2483776 + 16467364 = 1576^2 + 4058^2 .

It is an unprimeable number.

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, 36185 + ... + 36704.

It is an arithmetic number, because the mean of its divisors is an integer number (1785805).

Almost surely, 2^18951140 is an apocalyptic number.

18951140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18951140 is an abundant number, since it is smaller than the sum of its proper divisors (23908180).

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

18951140 is a wasteful number, since it uses less digits than its factorization.

18951140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72911 (or 72909 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 18951140 is about 4353.2907093370. The cubic root of 18951140 is about 266.6112350061.

It can be divided in two parts, 18951 and 140, that added together give a palindrome (19091).

The spelling of 18951140 in words is "eighteen million, nine hundred fifty-one thousand, one hundred forty".