390994553 has 2 divisors, whose sum is σ = 390994554. Its totient is φ = 390994552.

The previous prime is 390994547. The next prime is 390994579. The reversal of 390994553 is 355499093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 362978704 + 28015849 = 19052^2 + 5293^2 .

It is a cyclic number.

It is not a de Polignac number, because 390994553 - 2¹⁶ = 390929017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 390994498 and 390994507.

It is not a weakly prime, because it can be changed into another prime (390994753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195497276 + 195497277.

It is an arithmetic number, because the mean of its divisors is an integer number (195497277).

Almost surely, 2^390994553 is an apocalyptic number.

It is an amenable number.

390994553 is a deficient number, since it is larger than the sum of its proper divisors (1).

390994553 is an equidigital number, since it uses as much as digits as its factorization.

390994553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 656100, while the sum is 47.

The square root of 390994553 is about 19773.5821994903. The cubic root of 390994553 is about 731.2348855278.

The spelling of 390994553 in words is "three hundred ninety million, nine hundred ninety-four thousand, five hundred fifty-three".