188420490 has 48 divisors (see below), whose sum is σ = 491051808. Its totient is φ = 50126688.

The previous prime is 188420471. The next prime is 188420579. The reversal of 188420490 is 94024881.

188420490 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39789 + ... + 44271.

It is an arithmetic number, because the mean of its divisors is an integer number (10230246).

Almost surely, 2^188420490 is an apocalyptic number.

188420490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

188420490 is an abundant number, since it is smaller than the sum of its proper divisors (302631318).

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

188420490 is a wasteful number, since it uses less digits than its factorization.

188420490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4963 (or 4960 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 188420490 is about 13726.6343289242. The cubic root of 188420490 is about 573.2922131887.

The spelling of 188420490 in words is "one hundred eighty-eight million, four hundred twenty thousand, four hundred ninety".