996399138 has 128 divisors (see below), whose sum is σ = 2502130176. Its totient is φ = 258048000.

The previous prime is 996399137. The next prime is 996399149. The reversal of 996399138 is 831993699.

996399138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×996399138² = 1985622484414286088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (996399133) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2956506 + ... + 2956842.

It is an arithmetic number, because the mean of its divisors is an integer number (19547892).

Almost surely, 2^996399138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 996399138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1251065088).

996399138 is an abundant number, since it is smaller than the sum of its proper divisors (1505731038).

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

996399138 is a wasteful number, since it uses less digits than its factorization.

996399138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 508.

The product of its digits is 2834352, while the sum is 57.

The square root of 996399138 is about 31565.7906284636. The cubic root of 996399138 is about 998.7982690880.

The spelling of 996399138 in words is "nine hundred ninety-six million, three hundred ninety-nine thousand, one hundred thirty-eight".