18973540 has 24 divisors (see below), whose sum is σ = 41219640. Its totient is φ = 7327488.

The previous prime is 18973531. The next prime is 18973553. The reversal of 18973540 is 4537981.

It can be written as a sum of positive squares in 4 ways, for example, as 2196324 + 16777216 = 1482^2 + 4096^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18973540.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15777 + ... + 16936.

It is an arithmetic number, because the mean of its divisors is an integer number (1717485).

Almost surely, 2^18973540 is an apocalyptic number.

18973540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18973540 is an abundant number, since it is smaller than the sum of its proper divisors (22246100).

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

18973540 is a wasteful number, since it uses less digits than its factorization.

18973540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32751 (or 32749 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 18973540 is about 4355.8627159267. The cubic root of 18973540 is about 266.7162373125.

The spelling of 18973540 in words is "eighteen million, nine hundred seventy-three thousand, five hundred forty".