189981902 has 32 divisors (see below), whose sum is σ = 338087520. Its totient is φ = 79073280.

The previous prime is 189981901. The next prime is 189981907. The reversal of 189981902 is 209189981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189981901) 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, 6974 + ... + 20702.

It is an arithmetic number, because the mean of its divisors is an integer number (10565235).

Almost surely, 2^189981902 is an apocalyptic number.

189981902 is a deficient number, since it is larger than the sum of its proper divisors (148105618).

189981902 is a wasteful number, since it uses less digits than its factorization.

189981902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13796.

The product of its (nonzero) digits is 93312, while the sum is 47.

The square root of 189981902 is about 13783.3922529978. The cubic root of 189981902 is about 574.8714540624.

The spelling of 189981902 in words is "one hundred eighty-nine million, nine hundred eighty-one thousand, nine hundred two".