709234921 has 8 divisors (see below), whose sum is σ = 712603080. Its totient is φ = 705873792.

The previous prime is 709234891. The next prime is 709234927. The reversal of 709234921 is 129432907.

709234921 = T₂₁₇₄₃ + T₂₁₇₄₄ + T₂₁₇₄₅.

It can be written as a sum of positive squares in 4 ways, for example, as 517107600 + 192127321 = 22740^2 + 13861^2 .

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 709234921 - 2¹¹ = 709232873 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (709234927) 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, 348535 + ... + 350563.

It is an arithmetic number, because the mean of its divisors is an integer number (89075385).

Almost surely, 2^709234921 is an apocalyptic number.

709234921 is the 21745-th centered triangular number.

It is an amenable number.

709234921 is a deficient number, since it is larger than the sum of its proper divisors (3368159).

709234921 is a wasteful number, since it uses less digits than its factorization.

709234921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3515.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 709234921 is about 26631.4648677086. The cubic root of 709234921 is about 891.7915857166.

The spelling of 709234921 in words is "seven hundred nine million, two hundred thirty-four thousand, nine hundred twenty-one".