190925921 has 8 divisors (see below), whose sum is σ = 199668480. Its totient is φ = 182220192.

The previous prime is 190925909. The next prime is 190925939. The reversal of 190925921 is 129529091.

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 190925921 - 2¹⁰ = 190924897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190925941) 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, 1685 + ... + 19613.

It is an arithmetic number, because the mean of its divisors is an integer number (24958560).

Almost surely, 2^190925921 is an apocalyptic number.

It is an amenable number.

190925921 is a deficient number, since it is larger than the sum of its proper divisors (8742559).

190925921 is a wasteful number, since it uses less digits than its factorization.

190925921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18415.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 190925921 is about 13817.5946170091. The cubic root of 190925921 is about 575.8220589514.

The spelling of 190925921 in words is "one hundred ninety million, nine hundred twenty-five thousand, nine hundred twenty-one".