390115405 has 8 divisors (see below), whose sum is σ = 495676152. Its totient is φ = 293733888.

The previous prime is 390115403. The next prime is 390115423. The reversal of 390115405 is 504511093.

It can be written as a sum of positive squares in 4 ways, for example, as 6817321 + 383298084 = 2611^2 + 19578^2 .

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

It is not a de Polignac number, because 390115405 - 2¹ = 390115403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390115403) 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, 2294712 + ... + 2294881.

It is an arithmetic number, because the mean of its divisors is an integer number (61959519).

Almost surely, 2^390115405 is an apocalyptic number.

It is an amenable number.

390115405 is a deficient number, since it is larger than the sum of its proper divisors (105560747).

390115405 is a wasteful number, since it uses less digits than its factorization.

390115405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4589615.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 390115405 is about 19751.3393216764. The cubic root of 390115405 is about 730.6864157264.

Adding to 390115405 its reverse (504511093), we get a palindrome (894626498).

It can be divided in two parts, 3901 and 15405, that added together give a triangular number (19306 = T₁₉₆).

The spelling of 390115405 in words is "three hundred ninety million, one hundred fifteen thousand, four hundred five".