390857461 has 2 divisors, whose sum is σ = 390857462. Its totient is φ = 390857460.

The previous prime is 390857449. The next prime is 390857471. The reversal of 390857461 is 164758093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 390813361 + 44100 = 19769^2 + 210^2 .

It is an emirp because it is prime and its reverse (164758093) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 390857461 - 2⁷ = 390857333 is a prime.

It is a super-3 number, since 3×390857461³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (390857471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195428730 + 195428731.

It is an arithmetic number, because the mean of its divisors is an integer number (195428731).

Almost surely, 2^390857461 is an apocalyptic number.

It is an amenable number.

390857461 is a deficient number, since it is larger than the sum of its proper divisors (1).

390857461 is an equidigital number, since it uses as much as digits as its factorization.

390857461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 390857461 is about 19770.1153512062. The cubic root of 390857461 is about 731.1494127502.

The spelling of 390857461 in words is "three hundred ninety million, eight hundred fifty-seven thousand, four hundred sixty-one".