190731989 has 8 divisors (see below), whose sum is σ = 218201088. Its totient is φ = 163318320.

The previous prime is 190731977. The next prime is 190731997. The reversal of 190731989 is 989137091.

It is a happy number.

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 190731989 - 2¹² = 190727893 is a prime.

It is a super-2 number, since 2×190731989² = 72757383255792242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190731949) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6197 + ... + 20490.

It is an arithmetic number, because the mean of its divisors is an integer number (27275136).

Almost surely, 2^190731989 is an apocalyptic number.

It is an amenable number.

190731989 is a deficient number, since it is larger than the sum of its proper divisors (27469099).

190731989 is a wasteful number, since it uses less digits than its factorization.

190731989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27715.

The product of its (nonzero) digits is 122472, while the sum is 47.

The square root of 190731989 is about 13810.5752595611. The cubic root of 190731989 is about 575.6270301608.

The spelling of 190731989 in words is "one hundred ninety million, seven hundred thirty-one thousand, nine hundred eighty-nine".