398654489 has 4 divisors (see below), whose sum is σ = 404604624. Its totient is φ = 392704356.

The previous prime is 398654467. The next prime is 398654497. The reversal of 398654489 is 984456893.

It is a happy number.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398654489 is a prime.

It is a super-2 number, since 2×398654489² = 317850803199702242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398654429) 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, 2974967 + ... + 2975100.

It is an arithmetic number, because the mean of its divisors is an integer number (101151156).

Almost surely, 2^398654489 is an apocalyptic number.

It is an amenable number.

398654489 is a deficient number, since it is larger than the sum of its proper divisors (5950135).

398654489 is an equidigital number, since it uses as much as digits as its factorization.

398654489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5950134.

The product of its digits is 7464960, while the sum is 56.

The square root of 398654489 is about 19966.3338898256. Note that the first 3 decimals coincide. The cubic root of 398654489 is about 735.9792208463.

The spelling of 398654489 in words is "three hundred ninety-eight million, six hundred fifty-four thousand, four hundred eighty-nine".