390989097 has 6 divisors (see below), whose sum is σ = 564762042. Its totient is φ = 260659392.

The previous prime is 390989089. The next prime is 390989111. The reversal of 390989097 is 790989093.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 352350441 + 38638656 = 18771^2 + 6216^2 .

It is not a de Polignac number, because 390989097 - 2³ = 390989089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (390989017) 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 5 ways as a sum of consecutive naturals, for example, 21721608 + ... + 21721625.

It is an arithmetic number, because the mean of its divisors is an integer number (94127007).

Almost surely, 2^390989097 is an apocalyptic number.

It is an amenable number.

390989097 is a deficient number, since it is larger than the sum of its proper divisors (173772945).

390989097 is a wasteful number, since it uses less digits than its factorization.

390989097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43443239 (or 43443236 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 54.

The square root of 390989097 is about 19773.4442371581. Note that the first 3 decimals coincide. The cubic root of 390989097 is about 731.2314842561.

The spelling of 390989097 in words is "three hundred ninety million, nine hundred eighty-nine thousand, ninety-seven".