30187998 has 32 divisors (see below), whose sum is σ = 70617600. Its totient is φ = 9532728.

The previous prime is 30187957. The next prime is 30188023. The reversal of 30187998 is 89978103.

It is a super-2 number, since 2×30187998² = 1822630446496008, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13686 + ... + 15737.

It is an arithmetic number, because the mean of its divisors is an integer number (2206800).

Almost surely, 2^30187998 is an apocalyptic number.

30187998 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

30187998 is an abundant number, since it is smaller than the sum of its proper divisors (40429602).

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

30187998 is a wasteful number, since it uses less digits than its factorization.

30187998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29453 (or 29447 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 30187998 is about 5494.3605633413. The cubic root of 30187998 is about 311.3709589380.

The spelling of 30187998 in words is "thirty million, one hundred eighty-seven thousand, nine hundred ninety-eight".