390340837 has 2 divisors, whose sum is σ = 390340838. Its totient is φ = 390340836.

The previous prime is 390340823. The next prime is 390340877. The reversal of 390340837 is 738043093.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 384120801 + 6220036 = 19599^2 + 2494^2 .

It is a cyclic number.

It is not a de Polignac number, because 390340837 - 2¹⁹ = 389816549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 390340796 and 390340805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390340877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195170418 + 195170419.

It is an arithmetic number, because the mean of its divisors is an integer number (195170419).

Almost surely, 2^390340837 is an apocalyptic number.

It is an amenable number.

390340837 is a deficient number, since it is larger than the sum of its proper divisors (1).

390340837 is an equidigital number, since it uses as much as digits as its factorization.

390340837 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 390340837 is about 19757.0452497331. The cubic root of 390340837 is about 730.8271333874.

The spelling of 390340837 in words is "three hundred ninety million, three hundred forty thousand, eight hundred thirty-seven".