738775721 has 2 divisors, whose sum is σ = 738775722. Its totient is φ = 738775720.

The previous prime is 738775691. The next prime is 738775753. The reversal of 738775721 is 127577837.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 406224025 + 332551696 = 20155^2 + 18236^2 .

It is a cyclic number.

It is not a de Polignac number, because 738775721 - 2¹⁴ = 738759337 is a prime.

It is not a weakly prime, because it can be changed into another prime (738775021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 369387860 + 369387861.

It is an arithmetic number, because the mean of its divisors is an integer number (369387861).

Almost surely, 2^738775721 is an apocalyptic number.

It is an amenable number.

738775721 is a deficient number, since it is larger than the sum of its proper divisors (1).

738775721 is an equidigital number, since it uses as much as digits as its factorization.

738775721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576240, while the sum is 47.

The square root of 738775721 is about 27180.4290069160. The cubic root of 738775721 is about 904.0050810434.

The spelling of 738775721 in words is "seven hundred thirty-eight million, seven hundred seventy-five thousand, seven hundred twenty-one".