18651416 has 32 divisors (see below), whose sum is σ = 40538880. Its totient is φ = 7879200.

The previous prime is 18651403. The next prime is 18651419. The reversal of 18651416 is 61415681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18651419) 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, 1631 + ... + 6321.

It is an arithmetic number, because the mean of its divisors is an integer number (1266840).

Almost surely, 2^18651416 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18651416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20269440).

18651416 is an abundant number, since it is smaller than the sum of its proper divisors (21887464).

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

18651416 is a wasteful number, since it uses less digits than its factorization.

18651416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4775 (or 4771 counting only the distinct ones).

The product of its digits is 5760, while the sum is 32.

The square root of 18651416 is about 4318.7285165891. The cubic root of 18651416 is about 265.1982188494.

The spelling of 18651416 in words is "eighteen million, six hundred fifty-one thousand, four hundred sixteen".