999989430 has 64 divisors (see below), whose sum is σ = 2622267648. Its totient is φ = 242040960.

The previous prime is 999989429. The next prime is 999989447. The reversal of 999989430 is 34989999.

It is a super-2 number, since 2×999989430² = 1999957720223449800, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 247809 + ... + 251811.

It is an arithmetic number, because the mean of its divisors is an integer number (40972932).

Almost surely, 2^999989430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999989430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1311133824).

999989430 is an abundant number, since it is smaller than the sum of its proper divisors (1622278218).

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

999989430 is a wasteful number, since it uses less digits than its factorization.

999989430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4781.

The product of its (nonzero) digits is 5668704, while the sum is 60.

The square root of 999989430 is about 31622.6094748678. The cubic root of 999989430 is about 999.9964766543.

The spelling of 999989430 in words is "nine hundred ninety-nine million, nine hundred eighty-nine thousand, four hundred thirty".