399293505 has 48 divisors (see below), whose sum is σ = 752431680. Its totient is φ = 194707584.

The previous prime is 399293491. The next prime is 399293509. The reversal of 399293505 is 505392993.

It is not a de Polignac number, because 399293505 - 2⁶ = 399293441 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (399293509) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 59406 + ... + 65784.

It is an arithmetic number, because the mean of its divisors is an integer number (15675660).

Almost surely, 2^399293505 is an apocalyptic number.

It is an amenable number.

399293505 is a deficient number, since it is larger than the sum of its proper divisors (353138175).

399293505 is a wasteful number, since it uses less digits than its factorization.

399293505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6510 (or 6507 counting only the distinct ones).

The product of its (nonzero) digits is 328050, while the sum is 45.

The square root of 399293505 is about 19982.3298191177. The cubic root of 399293505 is about 736.3722524452.

It can be divided in two parts, 39929 and 3505, that added together give a palindrome (43434).

The spelling of 399293505 in words is "three hundred ninety-nine million, two hundred ninety-three thousand, five hundred five".