397913773 has 4 divisors (see below), whose sum is σ = 397953820. Its totient is φ = 397873728.

The previous prime is 397913753. The next prime is 397913779. The reversal of 397913773 is 377319793.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 381889764 + 16024009 = 19542^2 + 4003^2 .

It is a cyclic number.

It is not a de Polignac number, because 397913773 - 2⁵ = 397913741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397913779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7411 + ... + 29167.

It is an arithmetic number, because the mean of its divisors is an integer number (99488455).

Almost surely, 2^397913773 is an apocalyptic number.

It is an amenable number.

397913773 is a deficient number, since it is larger than the sum of its proper divisors (40047).

397913773 is a wasteful number, since it uses less digits than its factorization.

397913773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40046.

The product of its digits is 750141, while the sum is 49.

The square root of 397913773 is about 19947.7761417156. The cubic root of 397913773 is about 735.5231119547.

The spelling of 397913773 in words is "three hundred ninety-seven million, nine hundred thirteen thousand, seven hundred seventy-three".