231724407 has 4 divisors (see below), whose sum is σ = 308965880. Its totient is φ = 154482936.

The previous prime is 231724387. The next prime is 231724417. The reversal of 231724407 is 704427132.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 231724407 - 2⁶ = 231724343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231724417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38620732 + ... + 38620737.

It is an arithmetic number, because the mean of its divisors is an integer number (77241470).

Almost surely, 2^231724407 is an apocalyptic number.

231724407 is a deficient number, since it is larger than the sum of its proper divisors (77241473).

231724407 is an equidigital number, since it uses as much as digits as its factorization.

231724407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77241472.

The product of its (nonzero) digits is 9408, while the sum is 30.

The square root of 231724407 is about 15222.4967400226. The cubic root of 231724407 is about 614.2199615449.

The spelling of 231724407 in words is "two hundred thirty-one million, seven hundred twenty-four thousand, four hundred seven".