399660033 has 4 divisors (see below), whose sum is σ = 532880048. Its totient is φ = 266440020.

The previous prime is 399660031. The next prime is 399660047. The reversal of 399660033 is 330066993.

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.

It is not a de Polignac number, because 399660033 - 2¹ = 399660031 is a prime.

It is a super-2 number, since 2×399660033² = 319456283955122178, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 399659973 and 399660000.

It is not an unprimeable number, because it can be changed into a prime (399660031) 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, 66610003 + ... + 66610008.

It is an arithmetic number, because the mean of its divisors is an integer number (133220012).

Almost surely, 2^399660033 is an apocalyptic number.

It is an amenable number.

399660033 is a deficient number, since it is larger than the sum of its proper divisors (133220015).

399660033 is a wasteful number, since it uses less digits than its factorization.

399660033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133220014.

The product of its (nonzero) digits is 78732, while the sum is 39.

The square root of 399660033 is about 19991.4990183328. The cubic root of 399660033 is about 736.5974990397.

The spelling of 399660033 in words is "three hundred ninety-nine million, six hundred sixty thousand, thirty-three".