190613721 has 8 divisors (see below), whose sum is σ = 255119040. Its totient is φ = 126592112.

The previous prime is 190613713. The next prime is 190613737. The reversal of 190613721 is 127316091.

190613721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 190613721 - 2³ = 190613713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (190613701) 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, 120006 + ... + 121583.

It is an arithmetic number, because the mean of its divisors is an integer number (31889880).

Almost surely, 2^190613721 is an apocalyptic number.

It is an amenable number.

190613721 is a deficient number, since it is larger than the sum of its proper divisors (64505319).

190613721 is a wasteful number, since it uses less digits than its factorization.

190613721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241855.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 190613721 is about 13806.2928043700. The cubic root of 190613721 is about 575.5080283894.

The spelling of 190613721 in words is "one hundred ninety million, six hundred thirteen thousand, seven hundred twenty-one".