187990693 has 8 divisors (see below), whose sum is σ = 215874720. Its totient is φ = 161905680.

The previous prime is 187990687. The next prime is 187990703. The reversal of 187990693 is 396099781.

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 187990693 - 2¹⁷ = 187859621 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 187990693.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187990493) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 449530 + ... + 449947.

It is an arithmetic number, because the mean of its divisors is an integer number (26984340).

Almost surely, 2^187990693 is an apocalyptic number.

It is an amenable number.

187990693 is a deficient number, since it is larger than the sum of its proper divisors (27884027).

187990693 is a wasteful number, since it uses less digits than its factorization.

187990693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899507.

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 187990693 is about 13710.9698052326. The cubic root of 187990693 is about 572.8559781469.

The spelling of 187990693 in words is "one hundred eighty-seven million, nine hundred ninety thousand, six hundred ninety-three".