100188390 has 32 divisors (see below), whose sum is σ = 242938080. Its totient is φ = 26440704.

The previous prime is 100188371. The next prime is 100188397. The reversal of 100188390 is 93881001.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100188397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14305 + ... + 20124.

It is an arithmetic number, because the mean of its divisors is an integer number (7591815).

Almost surely, 2^100188390 is an apocalyptic number.

100188390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

100188390 is an abundant number, since it is smaller than the sum of its proper divisors (142749690).

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

100188390 is a wasteful number, since it uses less digits than its factorization.

100188390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34536.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 100188390 is about 10009.4150678249. The cubic root of 100188390 is about 464.4501768220.

The spelling of 100188390 in words is "one hundred million, one hundred eighty-eight thousand, three hundred ninety".