398345723 has 4 divisors (see below), whose sum is σ = 399414048. Its totient is φ = 397277400.

The previous prime is 398345719. The next prime is 398345741. The reversal of 398345723 is 327543893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 398345723 - 2² = 398345719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398342723) 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, 533603 + ... + 534348.

It is an arithmetic number, because the mean of its divisors is an integer number (99853512).

Almost surely, 2^398345723 is an apocalyptic number.

398345723 is a deficient number, since it is larger than the sum of its proper divisors (1068325).

398345723 is a wasteful number, since it uses less digits than its factorization.

398345723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068324.

The product of its digits is 544320, while the sum is 44.

The square root of 398345723 is about 19958.6002264688. The cubic root of 398345723 is about 735.7891614838.

The spelling of 398345723 in words is "three hundred ninety-eight million, three hundred forty-five thousand, seven hundred twenty-three".