398999894 has 16 divisors (see below), whose sum is σ = 639985536. Its totient is φ = 185904000.

The previous prime is 398999879. The next prime is 398999947. The reversal of 398999894 is 498999893.

It is a super-2 number, since 2×398999894² = 318401830824022472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54662 + ... + 61529.

It is an arithmetic number, because the mean of its divisors is an integer number (39999096).

Almost surely, 2^398999894 is an apocalyptic number.

398999894 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

398999894 is a deficient number, since it is larger than the sum of its proper divisors (240985642).

398999894 is a wasteful number, since it uses less digits than its factorization.

398999894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116311.

The product of its digits is 45349632, while the sum is 68.

The square root of 398999894 is about 19974.9817021193. The cubic root of 398999894 is about 736.1917169022.

Subtracting 398999894 from its reverse (498999893), we obtain a palindrome (99999999).

The spelling of 398999894 in words is "three hundred ninety-eight million, nine hundred ninety-nine thousand, eight hundred ninety-four".