709309440 has 352 divisors, whose sum is σ = 2884796160. Its totient is φ = 161906688.

The previous prime is 709309439. The next prime is 709309457. The reversal of 709309440 is 44903907.

It is a super-2 number, since 2×709309440² = 1006239763346227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 709309395 and 709309404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 967314 + ... + 968046.

Almost surely, 2^709309440 is an apocalyptic number.

709309440 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 709309440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1442398080).

709309440 is an abundant number, since it is smaller than the sum of its proper divisors (2175486720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

709309440 is a wasteful number, since it uses less digits than its factorization.

709309440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774 (or 750 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 709309440 is about 26632.8639090880. The cubic root of 709309440 is about 891.8228180055.

The spelling of 709309440 in words is "seven hundred nine million, three hundred nine thousand, four hundred forty".