299670721 has 9 divisors (see below), whose sum is σ = 348737571. Its totient is φ = 256756752.

The previous prime is 299670671. The next prime is 299670739. The reversal of 299670721 is 127076992.

The square root of 299670721 is 17311.

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

It can be written as a sum of positive squares in only one way, i.e., 223353025 + 76317696 = 14945^2 + 8736^2 .

It is not a de Polignac number, because 299670721 - 2¹⁵ = 299637953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (299670751) 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, 119941 + ... + 122413.

It is an arithmetic number, because the mean of its divisors is an integer number (38748619).

Almost surely, 2^299670721 is an apocalyptic number.

299670721 is the 17311-st square number.

299670721 is the 8656-th centered octagonal number.

It is an amenable number.

299670721 is a deficient number, since it is larger than the sum of its proper divisors (49066850).

299670721 is an frugal number, since it uses more digits than its factorization.

299670721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4960 (or 2480 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 43.

The cubic root of 299670721 is about 669.1879379606.

The spelling of 299670721 in words is "two hundred ninety-nine million, six hundred seventy thousand, seven hundred twenty-one".