189497917 has 16 divisors (see below), whose sum is σ = 220809600. Its totient is φ = 159278400.

The previous prime is 189497879. The next prime is 189497923. The reversal of 189497917 is 719794981.

189497917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189497917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189497927) 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, 75834 + ... + 78292.

It is an arithmetic number, because the mean of its divisors is an integer number (13800600).

Almost surely, 2^189497917 is an apocalyptic number.

It is an amenable number.

189497917 is a deficient number, since it is larger than the sum of its proper divisors (31311683).

189497917 is a wasteful number, since it uses less digits than its factorization.

189497917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2676.

The product of its digits is 1143072, while the sum is 55.

The square root of 189497917 is about 13765.8242397613. The cubic root of 189497917 is about 574.3828710998.

The spelling of 189497917 in words is "one hundred eighty-nine million, four hundred ninety-seven thousand, nine hundred seventeen".