709427991 has 8 divisors (see below), whose sum is σ = 946494720. Its totient is φ = 472656632.

The previous prime is 709427921. The next prime is 709428001. The reversal of 709427991 is 199724907.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 709427991 - 2¹⁵ = 709395223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 709427991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (709427921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68175 + ... + 77888.

It is an arithmetic number, because the mean of its divisors is an integer number (118311840).

Almost surely, 2^709427991 is an apocalyptic number.

709427991 is a deficient number, since it is larger than the sum of its proper divisors (237066729).

709427991 is a wasteful number, since it uses less digits than its factorization.

709427991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147685.

The product of its (nonzero) digits is 285768, while the sum is 48.

The square root of 709427991 is about 26635.0894685939. The cubic root of 709427991 is about 891.8725004108.

The spelling of 709427991 in words is "seven hundred nine million, four hundred twenty-seven thousand, nine hundred ninety-one".