390989437 has 2 divisors, whose sum is σ = 390989438. Its totient is φ = 390989436.

The previous prime is 390989419. The next prime is 390989461. The reversal of 390989437 is 734989093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 281870521 + 109118916 = 16789^2 + 10446^2 .

It is a cyclic number.

It is not a de Polignac number, because 390989437 - 2⁷ = 390989309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390989737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195494718 + 195494719.

It is an arithmetic number, because the mean of its divisors is an integer number (195494719).

Almost surely, 2^390989437 is an apocalyptic number.

It is an amenable number.

390989437 is a deficient number, since it is larger than the sum of its proper divisors (1).

390989437 is an equidigital number, since it uses as much as digits as its factorization.

390989437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1469664, while the sum is 52.

The square root of 390989437 is about 19773.4528345456. The cubic root of 390989437 is about 731.2316962131.

The spelling of 390989437 in words is "three hundred ninety million, nine hundred eighty-nine thousand, four hundred thirty-seven".