398273309 has 16 divisors (see below), whose sum is σ = 461842560. Its totient is φ = 336399360.

The previous prime is 398273299. The next prime is 398273311. The reversal of 398273309 is 903372893.

It is a cyclic number.

It is not a de Polignac number, because 398273309 - 2²⁰ = 397224733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 398273309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398273329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 219014 + ... + 220824.

It is an arithmetic number, because the mean of its divisors is an integer number (28865160).

Almost surely, 2^398273309 is an apocalyptic number.

It is an amenable number.

398273309 is a deficient number, since it is larger than the sum of its proper divisors (63569251).

398273309 is a wasteful number, since it uses less digits than its factorization.

398273309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260.

The product of its (nonzero) digits is 244944, while the sum is 44.

The square root of 398273309 is about 19956.7860388390. The cubic root of 398273309 is about 735.7445731926.

The spelling of 398273309 in words is "three hundred ninety-eight million, two hundred seventy-three thousand, three hundred nine".