189971790 has 16 divisors (see below), whose sum is σ = 455932368. Its totient is φ = 50659136.

The previous prime is 189971783. The next prime is 189971797. The reversal of 189971790 is 97179981.

It is an interprime number because it is at equal distance from previous prime (189971783) and next prime (189971797).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189971797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3166167 + ... + 3166226.

It is an arithmetic number, because the mean of its divisors is an integer number (28495773).

Almost surely, 2^189971790 is an apocalyptic number.

189971790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189971790 is an abundant number, since it is smaller than the sum of its proper divisors (265960578).

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

189971790 is a wasteful number, since it uses less digits than its factorization.

189971790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6332403.

The product of its (nonzero) digits is 285768, while the sum is 51.

The square root of 189971790 is about 13783.0254298539. The cubic root of 189971790 is about 574.8612544886.

The spelling of 189971790 in words is "one hundred eighty-nine million, nine hundred seventy-one thousand, seven hundred ninety".