81399358 has 8 divisors (see below), whose sum is σ = 122713200. Its totient is φ = 40494960.

The previous prime is 81399313. The next prime is 81399377. The reversal of 81399358 is 85399318.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101863 + ... + 102658.

It is an arithmetic number, because the mean of its divisors is an integer number (15339150).

Almost surely, 2^81399358 is an apocalyptic number.

81399358 is a deficient number, since it is larger than the sum of its proper divisors (41313842).

81399358 is a wasteful number, since it uses less digits than its factorization.

81399358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204722.

The product of its digits is 233280, while the sum is 46.

The square root of 81399358 is about 9022.1592759162. The cubic root of 81399358 is about 433.3847845548.

The spelling of 81399358 in words is "eighty-one million, three hundred ninety-nine thousand, three hundred fifty-eight".