16864380 has 72 divisors (see below), whose sum is σ = 55097952. Its totient is φ = 4150656.

The previous prime is 16864373. The next prime is 16864409. The reversal of 16864380 is 8346861.

It is a happy number.

16864380 is a `hidden beast` number, since 1 + 6 + 8 + 643 + 8 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1264 + ... + 5943.

Almost surely, 2^16864380 is an apocalyptic number.

16864380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16864380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27548976).

16864380 is an abundant number, since it is smaller than the sum of its proper divisors (38233572).

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

16864380 is a wasteful number, since it uses less digits than its factorization.

16864380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7235 (or 7230 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 16864380 is about 4106.6263526160. The cubic root of 16864380 is about 256.4425734669.

The spelling of 16864380 in words is "sixteen million, eight hundred sixty-four thousand, three hundred eighty".