390040505 has 16 divisors (see below), whose sum is σ = 471599040. Its totient is φ = 309676608.

The previous prime is 390040471. The next prime is 390040513. The reversal of 390040505 is 505040093.

It is a cyclic number.

It is not a de Polignac number, because 390040505 - 2⁸ = 390040249 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 527426 + ... + 528164.

It is an arithmetic number, because the mean of its divisors is an integer number (29474940).

Almost surely, 2^390040505 is an apocalyptic number.

It is an amenable number.

390040505 is a deficient number, since it is larger than the sum of its proper divisors (81558535).

390040505 is a wasteful number, since it uses less digits than its factorization.

390040505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1400.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 390040505 is about 19749.4431567070. The cubic root of 390040505 is about 730.6396501499.

Adding to 390040505 its reverse (505040093), we get a palindrome (895080598).

The spelling of 390040505 in words is "three hundred ninety million, forty thousand, five hundred five".