390038905 has 8 divisors (see below), whose sum is σ = 495578952. Its totient is φ = 293676288.

The previous prime is 390038903. The next prime is 390038933. The reversal of 390038905 is 509830093.

It can be written as a sum of positive squares in 4 ways, for example, as 220700736 + 169338169 = 14856^2 + 13013^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 390038905 - 2¹ = 390038903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390038903) 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, 2294262 + ... + 2294431.

It is an arithmetic number, because the mean of its divisors is an integer number (61947369).

Almost surely, 2^390038905 is an apocalyptic number.

It is an amenable number.

390038905 is a deficient number, since it is larger than the sum of its proper divisors (105540047).

390038905 is a wasteful number, since it uses less digits than its factorization.

390038905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4588715.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 390038905 is about 19749.4026491942. The cubic root of 390038905 is about 730.6386510870.

Adding to 390038905 its reverse (509830093), we get a palindrome (899868998).

The spelling of 390038905 in words is "three hundred ninety million, thirty-eight thousand, nine hundred five".