390840532949 has 2 divisors, whose sum is σ = 390840532950. Its totient is φ = 390840532948.

The previous prime is 390840532879. The next prime is 390840532993. The reversal of 390840532949 is 949235048093.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 374458324900 + 16382208049 = 611930^2 + 127993^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390840532949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 390840532894 and 390840532903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390840532549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195420266474 + 195420266475.

It is an arithmetic number, because the mean of its divisors is an integer number (195420266475).

Almost surely, 2^390840532949 is an apocalyptic number.

It is an amenable number.

390840532949 is a deficient number, since it is larger than the sum of its proper divisors (1).

390840532949 is an equidigital number, since it uses as much as digits as its factorization.

390840532949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8398080, while the sum is 56.

The spelling of 390840532949 in words is "three hundred ninety billion, eight hundred forty million, five hundred thirty-two thousand, nine hundred forty-nine".