18701616 has 40 divisors (see below), whose sum is σ = 48677440. Its totient is φ = 6186816.

The previous prime is 18701611. The next prime is 18701621. The reversal of 18701616 is 61610781.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18701611) and next prime (18701621).

It is a super-2 number, since 2×18701616² = 699500882022912, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18701611) 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, 5271 + ... + 8073.

It is an arithmetic number, because the mean of its divisors is an integer number (1216936).

Almost surely, 2^18701616 is an apocalyptic number.

18701616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18701616 is an abundant number, since it is smaller than the sum of its proper divisors (29975824).

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

18701616 is a wasteful number, since it uses less digits than its factorization.

18701616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2953 (or 2947 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 18701616 is about 4324.5365069566. The cubic root of 18701616 is about 265.4359313560.

It can be divided in two parts, 1870 and 1616, that added together give a triangular number (3486 = T₈₃).

The spelling of 18701616 in words is "eighteen million, seven hundred one thousand, six hundred sixteen".