390121057 has 2 divisors, whose sum is σ = 390121058. Its totient is φ = 390121056.

The previous prime is 390121001. The next prime is 390121097. The reversal of 390121057 is 750121093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 362673936 + 27447121 = 19044^2 + 5239^2 .

It is an emirp because it is prime and its reverse (750121093) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390121057 is a prime.

It is a super-2 number, since 2×390121057² = 304388878229594498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (390121097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195060528 + 195060529.

It is an arithmetic number, because the mean of its divisors is an integer number (195060529).

Almost surely, 2^390121057 is an apocalyptic number.

It is an amenable number.

390121057 is a deficient number, since it is larger than the sum of its proper divisors (1).

390121057 is an equidigital number, since it uses as much as digits as its factorization.

390121057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 390121057 is about 19751.4824000630. The cubic root of 390121057 is about 730.6899444427.

The spelling of 390121057 in words is "three hundred ninety million, one hundred twenty-one thousand, fifty-seven".