815016399 has 8 divisors (see below), whose sum is σ = 1088825520. Its totient is φ = 542275776.

The previous prime is 815016347. The next prime is 815016401. The reversal of 815016399 is 993610518.

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

It is not a de Polignac number, because 815016399 - 2²³ = 806627791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 815016399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815016199) 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, 265342 + ... + 268395.

It is an arithmetic number, because the mean of its divisors is an integer number (136103190).

Almost surely, 2^815016399 is an apocalyptic number.

815016399 is a deficient number, since it is larger than the sum of its proper divisors (273809121).

815016399 is a wasteful number, since it uses less digits than its factorization.

815016399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534249.

The product of its (nonzero) digits is 58320, while the sum is 42.

The square root of 815016399 is about 28548.4920617535. The cubic root of 815016399 is about 934.0901284331.

The spelling of 815016399 in words is "eight hundred fifteen million, sixteen thousand, three hundred ninety-nine".