397743709 has 4 divisors (see below), whose sum is σ = 433902240. Its totient is φ = 361585180.

The previous prime is 397743683. The next prime is 397743727. The reversal of 397743709 is 907347793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 397743709 - 2⁵ = 397743677 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 (397743779) 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 in 3 ways as a sum of consecutive naturals, for example, 18079249 + ... + 18079270.

It is an arithmetic number, because the mean of its divisors is an integer number (108475560).

Almost surely, 2^397743709 is an apocalyptic number.

It is an amenable number.

397743709 is a deficient number, since it is larger than the sum of its proper divisors (36158531).

397743709 is a wasteful number, since it uses less digits than its factorization.

397743709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36158530.

The product of its (nonzero) digits is 1000188, while the sum is 49.

The square root of 397743709 is about 19943.5129553447. The cubic root of 397743709 is about 735.4183121753.

The spelling of 397743709 in words is "three hundred ninety-seven million, seven hundred forty-three thousand, seven hundred nine".