18961614 has 80 divisors (see below), whose sum is σ = 50738688. Its totient is φ = 5174928.

The previous prime is 18961609. The next prime is 18961619. The reversal of 18961614 is 41616981.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18961609) and next prime (18961619).

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18961619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 25719 + ... + 26445.

Almost surely, 2^18961614 is an apocalyptic number.

18961614 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18961614, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25369344).

18961614 is an abundant number, since it is smaller than the sum of its proper divisors (31777074).

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

18961614 is a wasteful number, since it uses less digits than its factorization.

18961614 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771 (or 762 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 18961614 is about 4354.4935411595. The cubic root of 18961614 is about 266.6603432528.

Subtracting from 18961614 its product of digits (10368), we obtain a triangular number (18951246 = T₆₁₅₆).

The spelling of 18961614 in words is "eighteen million, nine hundred sixty-one thousand, six hundred fourteen".