999618432 has 64 divisors (see below), whose sum is σ = 2660649600. Its totient is φ = 332527104.

The previous prime is 999618409. The next prime is 999618437. The reversal of 999618432 is 234816999.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999618437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207669 + ... + 212427.

It is an arithmetic number, because the mean of its divisors is an integer number (41572650).

Almost surely, 2^999618432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999618432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1330324800).

999618432 is an abundant number, since it is smaller than the sum of its proper divisors (1661031168).

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

999618432 is a wasteful number, since it uses less digits than its factorization.

999618432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5323 (or 5311 counting only the distinct ones).

The product of its digits is 839808, while the sum is 51.

The square root of 999618432 is about 31616.7429062514. The cubic root of 999618432 is about 999.8727944861.

The spelling of 999618432 in words is "nine hundred ninety-nine million, six hundred eighteen thousand, four hundred thirty-two".