399099481 has 4 divisors (see below), whose sum is σ = 435381264. Its totient is φ = 362817700.

The previous prime is 399099443. The next prime is 399099499. The reversal of 399099481 is 184990993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 184990993 = 11 ⋅16817363.

It is a cyclic number.

It is not a de Polignac number, because 399099481 - 2⁹ = 399098969 is a prime.

It is a super-2 number, since 2×399099481² = 318560791468938722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399099401) 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, 18140875 + ... + 18140896.

It is an arithmetic number, because the mean of its divisors is an integer number (108845316).

Almost surely, 2^399099481 is an apocalyptic number.

It is an amenable number.

399099481 is a deficient number, since it is larger than the sum of its proper divisors (36281783).

399099481 is a wasteful number, since it uses less digits than its factorization.

399099481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36281782.

The product of its (nonzero) digits is 629856, while the sum is 52.

The square root of 399099481 is about 19977.4743398659. The cubic root of 399099481 is about 736.2529608831.

The spelling of 399099481 in words is "three hundred ninety-nine million, ninety-nine thousand, four hundred eighty-one".