390990242 has 8 divisors (see below), whose sum is σ = 620984556. Its totient is φ = 183995392.

The previous prime is 390990221. The next prime is 390990247. The reversal of 390990242 is 242099093.

It can be written as a sum of positive squares in 2 ways, for example, as 382163401 + 8826841 = 19549^2 + 2971^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 390990196 and 390990205.

It is not an unprimeable number, because it can be changed into a prime (390990247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5749823 + ... + 5749890.

Almost surely, 2^390990242 is an apocalyptic number.

390990242 is a deficient number, since it is larger than the sum of its proper divisors (229994314).

390990242 is a wasteful number, since it uses less digits than its factorization.

390990242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11499732.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 390990242 is about 19773.4731901100. The cubic root of 390990242 is about 731.2321980520.

The spelling of 390990242 in words is "three hundred ninety million, nine hundred ninety thousand, two hundred forty-two".