999989376 has 32 divisors (see below), whose sum is σ = 2656222800. Its totient is φ = 333329664.

The previous prime is 999989371. The next prime is 999989411. The reversal of 999989376 is 673989999.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×999989376² = 1999957504225738752, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 999989376.

It is not an unprimeable number, because it can be changed into a prime (999989371) 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, 1301686 + ... + 1302453.

Almost surely, 2^999989376 is an apocalyptic number.

999989376 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

999989376 is an abundant number, since it is smaller than the sum of its proper divisors (1656233424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999989376 is a wasteful number, since it uses less digits than its factorization.

999989376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2604156 (or 2604144 counting only the distinct ones).

The product of its digits is 59521392, while the sum is 69.

The square root of 999989376 is about 31622.6086210483. The cubic root of 999989376 is about 999.9964586541.

The spelling of 999989376 in words is "nine hundred ninety-nine million, nine hundred eighty-nine thousand, three hundred seventy-six".