190743721 has 9 divisors (see below), whose sum is σ = 221998071. Its totient is φ = 163411752.

The previous prime is 190743697. The next prime is 190743727. The reversal of 190743721 is 127347091.

The square root of 190743721 is 13811.

It is a perfect power (a square), and thus also a powerful number.

190743721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 41024025 + 149719696 = 6405^2 + 12236^2 .

It is a de Polignac number, because none of the positive numbers 2^k-190743721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190743727) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 95691 + ... + 97663.

Almost surely, 2^190743721 is an apocalyptic number.

190743721 is the 13811-st square number.

190743721 is the 6906-th centered octagonal number.

It is an amenable number.

190743721 is a deficient number, since it is larger than the sum of its proper divisors (31254350).

190743721 is an frugal number, since it uses more digits than its factorization.

190743721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3960 (or 1980 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 34.

The cubic root of 190743721 is about 575.6388322675.

The spelling of 190743721 in words is "one hundred ninety million, seven hundred forty-three thousand, seven hundred twenty-one".