707400409 has 3 divisors (see below), whose sum is σ = 707427007. Its totient is φ = 707373812.

The previous prime is 707400403. The next prime is 707400479. The reversal of 707400409 is 904004707.

The square root of 707400409 is 26597.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 904004707 = 26737 ⋅33811.

It can be written as a sum of positive squares in only one way, i.e., 637310025 + 70090384 = 25245^2 + 8372^2 .

It is not a de Polignac number, because 707400409 - 2¹¹ = 707398361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (707400403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 13299 + ... + 39895.

Almost surely, 2^707400409 is an apocalyptic number.

707400409 is the 26597-th square number.

707400409 is the 13299-th centered octagonal number.

It is an amenable number.

707400409 is a deficient number, since it is larger than the sum of its proper divisors (26598).

707400409 is an frugal number, since it uses more digits than its factorization.

707400409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53194 (or 26597 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 31.

The cubic root of 707400409 is about 891.0220170295.

Multiplying 707400409 by its product of nonzero digits (7056), we get a square (4991417285904 = 2234148²).

The spelling of 707400409 in words is "seven hundred seven million, four hundred thousand, four hundred nine".