397499421773 has 2 divisors, whose sum is σ = 397499421774. Its totient is φ = 397499421772.

The previous prime is 397499421763. The next prime is 397499421791. The reversal of 397499421773 is 377124994793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393909374884 + 3590046889 = 627622^2 + 59917^2 .

It is an emirp because it is prime and its reverse (377124994793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397499421773 - 2²⁴ = 397482644557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397499421703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198749710886 + 198749710887.

It is an arithmetic number, because the mean of its divisors is an integer number (198749710887).

Almost surely, 2^397499421773 is an apocalyptic number.

It is an amenable number.

397499421773 is a deficient number, since it is larger than the sum of its proper divisors (1).

397499421773 is an equidigital number, since it uses as much as digits as its factorization.

397499421773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72013536, while the sum is 65.

The spelling of 397499421773 in words is "three hundred ninety-seven billion, four hundred ninety-nine million, four hundred twenty-one thousand, seven hundred seventy-three".