398981723 has 4 divisors (see below), whose sum is σ = 455979120. Its totient is φ = 341984328.

The previous prime is 398981711. The next prime is 398981729. The reversal of 398981723 is 327189893.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 327189893 = 211 ⋅1550663.

It is not a de Polignac number, because 398981723 - 2¹⁶ = 398916187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398981729) 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, 28498688 + ... + 28498701.

It is an arithmetic number, because the mean of its divisors is an integer number (113994780).

Almost surely, 2^398981723 is an apocalyptic number.

398981723 is a deficient number, since it is larger than the sum of its proper divisors (56997397).

398981723 is an equidigital number, since it uses as much as digits as its factorization.

398981723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56997396.

The product of its digits is 653184, while the sum is 50.

The square root of 398981723 is about 19974.5268529695. The cubic root of 398981723 is about 736.1805410072.

The spelling of 398981723 in words is "three hundred ninety-eight million, nine hundred eighty-one thousand, seven hundred twenty-three".