39739226409 has 9 divisors (see below), whose sum is σ = 57401968663. Its totient is φ = 26492418912.

The previous prime is 39739226383. The next prime is 39739226473. The reversal of 39739226409 is 90462293793.

The square root of 39739226409 is 199347.

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

39739226409 is a `hidden beast` number, since 3 + 9 + 7 + 3 + 9 + 226 + 409 = 666.

It can be written as a sum of positive squares in only one way, i.e., 38788120809 + 951105600 = 196947^2 + 30840^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 39739226409 - 2²³ = 39730837801 is a prime.

It is a super-2 number, since 2×39739226409² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39739226209) 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, 564817 + ... + 631265.

Almost surely, 2^39739226409 is an apocalyptic number.

39739226409 is the 199347-th square number.

39739226409 is the 99674-th centered octagonal number.

It is an amenable number.

39739226409 is a deficient number, since it is larger than the sum of its proper divisors (17662742254).

39739226409 is an frugal number, since it uses more digits than its factorization.

39739226409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132904 (or 66452 counting only the distinct ones).

The product of its (nonzero) digits is 4408992, while the sum is 54.

It can be divided in two parts, 397392 and 26409, that added together give a square (423801 = 651²).

The spelling of 39739226409 in words is "thirty-nine billion, seven hundred thirty-nine million, two hundred twenty-six thousand, four hundred nine".