189779640 has 64 divisors (see below), whose sum is σ = 582595200. Its totient is φ = 49429632.

The previous prime is 189779621. The next prime is 189779651. The reversal of 189779640 is 46977981.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13230 + ... + 23549.

It is an arithmetic number, because the mean of its divisors is an integer number (9103050).

Almost surely, 2^189779640 is an apocalyptic number.

189779640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189779640 is an abundant number, since it is smaller than the sum of its proper divisors (392815560).

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

189779640 is a wasteful number, since it uses less digits than its factorization.

189779640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36836 (or 36832 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 51.

The square root of 189779640 is about 13776.0531357860. The cubic root of 189779640 is about 574.6673715740.

The spelling of 189779640 in words is "one hundred eighty-nine million, seven hundred seventy-nine thousand, six hundred forty".