18857140 has 12 divisors (see below), whose sum is σ = 39600036. Its totient is φ = 7542848.

The previous prime is 18857129. The next prime is 18857149. The reversal of 18857140 is 4175881.

It can be written as a sum of positive squares in 2 ways, for example, as 15023376 + 3833764 = 3876^2 + 1958^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18857096 and 18857105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18857149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 471409 + ... + 471448.

It is an arithmetic number, because the mean of its divisors is an integer number (3300003).

Almost surely, 2^18857140 is an apocalyptic number.

18857140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18857140 is an abundant number, since it is smaller than the sum of its proper divisors (20742896).

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

18857140 is a wasteful number, since it uses less digits than its factorization.

18857140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942866 (or 942864 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 34.

The square root of 18857140 is about 4342.4808577586. The cubic root of 18857140 is about 266.1696959285.

It can be divided in two parts, 1885 and 7140, that added together give a square (9025 = 95²).

The spelling of 18857140 in words is "eighteen million, eight hundred fifty-seven thousand, one hundred forty".