390431749 has 2 divisors, whose sum is σ = 390431750. Its totient is φ = 390431748.

The previous prime is 390431747. The next prime is 390431753. The reversal of 390431749 is 947134093.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 369792900 + 20638849 = 19230^2 + 4543^2 .

It is a cyclic number.

It is not a de Polignac number, because 390431749 - 2¹ = 390431747 is a prime.

Together with 390431747, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390431747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195215874 + 195215875.

It is an arithmetic number, because the mean of its divisors is an integer number (195215875).

Almost surely, 2^390431749 is an apocalyptic number.

It is an amenable number.

390431749 is a deficient number, since it is larger than the sum of its proper divisors (1).

390431749 is an equidigital number, since it uses as much as digits as its factorization.

390431749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 390431749 is about 19759.3458646788. The cubic root of 390431749 is about 730.8838665400.

It can be divided in two parts, 3904 and 31749, that added together give a palindrome (35653).

The spelling of 390431749 in words is "three hundred ninety million, four hundred thirty-one thousand, seven hundred forty-nine".