168921400 has 48 divisors (see below), whose sum is σ = 413422200. Its totient is φ = 64010880.

The previous prime is 168921397. The next prime is 168921413. The reversal of 168921400 is 4129861.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18427 + ... + 26026.

Almost surely, 2^168921400 is an apocalyptic number.

168921400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168921400 is an abundant number, since it is smaller than the sum of its proper divisors (244500800).

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

168921400 is a wasteful number, since it uses less digits than its factorization.

168921400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44488 (or 44479 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 168921400 is about 12996.9765714954. The cubic root of 168921400 is about 552.7917557096.

It can be divided in two parts, 168921 and 400, that multiplied together give a square (67568400 = 8220²).

The spelling of 168921400 in words is "one hundred sixty-eight million, nine hundred twenty-one thousand, four hundred".