390358421 has 2 divisors, whose sum is σ = 390358422. Its totient is φ = 390358420.

The previous prime is 390358393. The next prime is 390358447. The reversal of 390358421 is 124853093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205779025 + 184579396 = 14345^2 + 13586^2 .

It is a cyclic number.

It is not a de Polignac number, because 390358421 - 2¹⁴ = 390342037 is a prime.

It is a super-2 number, since 2×390358421² = 304759393691226482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390358481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195179210 + 195179211.

It is an arithmetic number, because the mean of its divisors is an integer number (195179211).

Almost surely, 2^390358421 is an apocalyptic number.

It is an amenable number.

390358421 is a deficient number, since it is larger than the sum of its proper divisors (1).

390358421 is an equidigital number, since it uses as much as digits as its factorization.

390358421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 390358421 is about 19757.4902505354. The cubic root of 390358421 is about 730.8381072766.

The spelling of 390358421 in words is "three hundred ninety million, three hundred fifty-eight thousand, four hundred twenty-one".