18690540 has 48 divisors (see below), whose sum is σ = 57093120. Its totient is φ = 4530880.

The previous prime is 18690533. The next prime is 18690541. The reversal of 18690540 is 4509681.

18690540 = 1525² + 1526² + ... + 1532².

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (18690541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13500 + ... + 14819.

It is an arithmetic number, because the mean of its divisors is an integer number (1189440).

Almost surely, 2^18690540 is an apocalyptic number.

18690540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18690540 is an abundant number, since it is smaller than the sum of its proper divisors (38402580).

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

18690540 is a wasteful number, since it uses less digits than its factorization.

18690540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28342 (or 28340 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 18690540 is about 4323.2557176276. The cubic root of 18690540 is about 265.3835196827.

The spelling of 18690540 in words is "eighteen million, six hundred ninety thousand, five hundred forty".