99723439 has 4 divisors (see below), whose sum is σ = 102155760. Its totient is φ = 97291120.

The previous prime is 99723433. The next prime is 99723443. The reversal of 99723439 is 93432799.

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

It is a cyclic number.

It is not a de Polignac number, because 99723439 - 2⁹ = 99722927 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 (99723433) 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, 1216099 + ... + 1216180.

It is an arithmetic number, because the mean of its divisors is an integer number (25538940).

Almost surely, 2^99723439 is an apocalyptic number.

99723439 is a deficient number, since it is larger than the sum of its proper divisors (2432321).

99723439 is a wasteful number, since it uses less digits than its factorization.

99723439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2432320.

The product of its digits is 367416, while the sum is 46.

The square root of 99723439 is about 9986.1623760081. The cubic root of 99723439 is about 463.7305941415.

The spelling of 99723439 in words is "ninety-nine million, seven hundred twenty-three thousand, four hundred thirty-nine".