189400979 has 8 divisors (see below), whose sum is σ = 197007360. Its totient is φ = 181888200.

The previous prime is 189400969. The next prime is 189401011. The reversal of 189400979 is 979004981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189400979 - 2²⁰ = 188352403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189400969) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 19259 + ... + 27380.

It is an arithmetic number, because the mean of its divisors is an integer number (24625920).

Almost surely, 2^189400979 is an apocalyptic number.

189400979 is a deficient number, since it is larger than the sum of its proper divisors (7606381).

189400979 is a wasteful number, since it uses less digits than its factorization.

189400979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46801.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 189400979 is about 13762.3028232923. The cubic root of 189400979 is about 574.2849121975.

The spelling of 189400979 in words is "one hundred eighty-nine million, four hundred thousand, nine hundred seventy-nine".