398443887 has 16 divisors (see below), whose sum is σ = 599966560. Its totient is φ = 261273600.

The previous prime is 398443879. The next prime is 398443901. The reversal of 398443887 is 788344893.

It is not a de Polignac number, because 398443887 - 2³ = 398443879 is a prime.

It is a super-3 number, since 3×398443887³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398443867) 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, 119314 + ... + 122607.

It is an arithmetic number, because the mean of its divisors is an integer number (37497910).

Almost surely, 2^398443887 is an apocalyptic number.

398443887 is a deficient number, since it is larger than the sum of its proper divisors (201522673).

398443887 is a wasteful number, since it uses less digits than its factorization.

398443887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241991 (or 241985 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The square root of 398443887 is about 19961.0592654799. The cubic root of 398443887 is about 735.8495964869.

The spelling of 398443887 in words is "three hundred ninety-eight million, four hundred forty-three thousand, eight hundred eighty-seven".