397789541 has 2 divisors, whose sum is σ = 397789542. Its totient is φ = 397789540.

The previous prime is 397789507. The next prime is 397789583. The reversal of 397789541 is 145987793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 391644100 + 6145441 = 19790^2 + 2479^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397789541 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397789141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198894770 + 198894771.

It is an arithmetic number, because the mean of its divisors is an integer number (198894771).

Almost surely, 2^397789541 is an apocalyptic number.

It is an amenable number.

397789541 is a deficient number, since it is larger than the sum of its proper divisors (1).

397789541 is an equidigital number, since it uses as much as digits as its factorization.

397789541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1905120, while the sum is 53.

The square root of 397789541 is about 19944.6619675541. The cubic root of 397789541 is about 735.4465585031.

The spelling of 397789541 in words is "three hundred ninety-seven million, seven hundred eighty-nine thousand, five hundred forty-one".