75431399 has 4 divisors (see below), whose sum is σ = 75937800. Its totient is φ = 74925000.

The previous prime is 75431357. The next prime is 75431413. The reversal of 75431399 is 99313457.

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 75431399 - 2²⁰ = 74382823 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 (75431309) 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, 252977 + ... + 253274.

It is an arithmetic number, because the mean of its divisors is an integer number (18984450).

Almost surely, 2^75431399 is an apocalyptic number.

75431399 is a deficient number, since it is larger than the sum of its proper divisors (506401).

75431399 is a wasteful number, since it uses less digits than its factorization.

75431399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506400.

The product of its digits is 102060, while the sum is 41.

The square root of 75431399 is about 8685.1251574171. The cubic root of 75431399 is about 422.5233562010.

The spelling of 75431399 in words is "seventy-five million, four hundred thirty-one thousand, three hundred ninety-nine".