18943140 has 48 divisors (see below), whose sum is σ = 53303040. Its totient is φ = 5026560.

The previous prime is 18943129. The next prime is 18943147. The reversal of 18943140 is 4134981.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 18943098 and 18943107.

It is not an unprimeable number, because it can be changed into a prime (18943147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13680 + ... + 15000.

It is an arithmetic number, because the mean of its divisors is an integer number (1110480).

Almost surely, 2^18943140 is an apocalyptic number.

18943140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18943140 is an abundant number, since it is smaller than the sum of its proper divisors (34359900).

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

18943140 is a wasteful number, since it uses less digits than its factorization.

18943140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572 (or 1570 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 18943140 is about 4352.3717672092. The cubic root of 18943140 is about 266.5737141309.

The spelling of 18943140 in words is "eighteen million, nine hundred forty-three thousand, one hundred forty".