18916740 has 60 divisors (see below), whose sum is σ = 59347596. Its totient is φ = 5044032.

The previous prime is 18916739. The next prime is 18916747. The reversal of 18916740 is 4761981.

It can be written as a sum of positive squares in 2 ways, for example, as 11819844 + 7096896 = 3438^2 + 2664^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18916695 and 18916704.

It is not an unprimeable number, because it can be changed into a prime (18916747) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4219 + ... + 7458.

Almost surely, 2^18916740 is an apocalyptic number.

18916740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18916740 is an abundant number, since it is smaller than the sum of its proper divisors (40430856).

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

18916740 is a wasteful number, since it uses less digits than its factorization.

18916740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11698 (or 11687 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 18916740 is about 4349.3378806434. The cubic root of 18916740 is about 266.4498202417.

The spelling of 18916740 in words is "eighteen million, nine hundred sixteen thousand, seven hundred forty".