739976561 has 4 divisors (see below), whose sum is σ = 783504612. Its totient is φ = 696448512.

The previous prime is 739976521. The next prime is 739976591. The reversal of 739976561 is 165679937.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 165679937 = 2221 ⋅74597.

It can be written as a sum of positive squares in 2 ways, for example, as 637865536 + 102111025 = 25256^2 + 10105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-739976561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (739976521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21764000 + ... + 21764033.

It is an arithmetic number, because the mean of its divisors is an integer number (195876153).

Almost surely, 2^739976561 is an apocalyptic number.

It is an amenable number.

739976561 is a deficient number, since it is larger than the sum of its proper divisors (43528051).

739976561 is a wasteful number, since it uses less digits than its factorization.

739976561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43528050.

The product of its digits is 2143260, while the sum is 53.

The square root of 739976561 is about 27202.5101966712. The cubic root of 739976561 is about 904.4946196974.

The spelling of 739976561 in words is "seven hundred thirty-nine million, nine hundred seventy-six thousand, five hundred sixty-one".