390807242 has 12 divisors (see below), whose sum is σ = 681918930. Its totient is φ = 167488776.

The previous prime is 390807229. The next prime is 390807247. The reversal of 390807242 is 242708093.

It can be written as a sum of positive squares in only one way, i.e., 258534241 + 132273001 = 16079^2 + 11501^2 .

It is not an unprimeable number, because it can be changed into a prime (390807247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1993817 + ... + 1994012.

Almost surely, 2^390807242 is an apocalyptic number.

390807242 is a deficient number, since it is larger than the sum of its proper divisors (291111688).

390807242 is a wasteful number, since it uses less digits than its factorization.

390807242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3987845 (or 3987838 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 390807242 is about 19768.8452368873. The cubic root of 390807242 is about 731.1180976983.

The spelling of 390807242 in words is "three hundred ninety million, eight hundred seven thousand, two hundred forty-two".