390531949 has 2 divisors, whose sum is σ = 390531950. Its totient is φ = 390531948.

The previous prime is 390531941. The next prime is 390531961. The reversal of 390531949 is 949135093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 275892100 + 114639849 = 16610^2 + 10707^2 .

It is an emirp because it is prime and its reverse (949135093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 390531949 - 2³ = 390531941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390531941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195265974 + 195265975.

It is an arithmetic number, because the mean of its divisors is an integer number (195265975).

Almost surely, 2^390531949 is an apocalyptic number.

It is an amenable number.

390531949 is a deficient number, since it is larger than the sum of its proper divisors (1).

390531949 is an equidigital number, since it uses as much as digits as its factorization.

390531949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131220, while the sum is 43.

The square root of 390531949 is about 19761.8812110588. The cubic root of 390531949 is about 730.9463856184.

The spelling of 390531949 in words is "three hundred ninety million, five hundred thirty-one thousand, nine hundred forty-nine".