18491716 has 24 divisors (see below), whose sum is σ = 34466040. Its totient is φ = 8650752.

The previous prime is 18491713. The next prime is 18491719. The reversal of 18491716 is 61719481.

It is an interprime number because it is at equal distance from previous prime (18491713) and next prime (18491719).

It can be written as a sum of positive squares in 4 ways, for example, as 87616 + 18404100 = 296^2 + 4290^2 .

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18491713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12420 + ... + 13828.

It is an arithmetic number, because the mean of its divisors is an integer number (1436085).

Almost surely, 2^18491716 is an apocalyptic number.

It is an amenable number.

18491716 is a deficient number, since it is larger than the sum of its proper divisors (15974324).

18491716 is a wasteful number, since it uses less digits than its factorization.

18491716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623 (or 1621 counting only the distinct ones).

The product of its digits is 12096, while the sum is 37.

The square root of 18491716 is about 4300.1995302544. The cubic root of 18491716 is about 264.4391413280.

The spelling of 18491716 in words is "eighteen million, four hundred ninety-one thousand, seven hundred sixteen".