188213400 has 144 divisors (see below), whose sum is σ = 652666560. Its totient is φ = 48556800.

The previous prime is 188213357. The next prime is 188213419. The reversal of 188213400 is 4312881.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 54114 + ... + 57486.

Almost surely, 2^188213400 is an apocalyptic number.

188213400 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 188213400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (326333280).

188213400 is an abundant number, since it is smaller than the sum of its proper divisors (464453160).

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

188213400 is a wasteful number, since it uses less digits than its factorization.

188213400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3426 (or 3414 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 188213400 is about 13719.0888910306. The cubic root of 188213400 is about 573.0821040395.

The spelling of 188213400 in words is "one hundred eighty-eight million, two hundred thirteen thousand, four hundred".