18946340 has 36 divisors (see below), whose sum is σ = 46285596. Its totient is φ = 6495552.

The previous prime is 18946339. The next prime is 18946349. The reversal of 18946340 is 4364981.

It can be written as a sum of positive squares in 2 ways, for example, as 13147876 + 5798464 = 3626^2 + 2408^2 .

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 18946340.

It is not an unprimeable number, because it can be changed into a prime (18946349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8687 + ... + 10646.

It is an arithmetic number, because the mean of its divisors is an integer number (1285711).

Almost surely, 2^18946340 is an apocalyptic number.

18946340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18946340 is an abundant number, since it is smaller than the sum of its proper divisors (27339256).

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

18946340 is a wasteful number, since it uses less digits than its factorization.

18946340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19356 (or 19347 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 18946340 is about 4352.7393673410. The cubic root of 18946340 is about 266.5887237484.

The spelling of 18946340 in words is "eighteen million, nine hundred forty-six thousand, three hundred forty".