999738 has 12 divisors (see below), whose sum is σ = 2166138. Its totient is φ = 333240.

The previous prime is 999727. The next prime is 999749. The reversal of 999738 is 837999.

It is a happy number.

999738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (999727) and next prime (999749).

It can be written as a sum of positive squares in only one way, i.e., 986049 + 13689 = 993^2 + 117^2 .

It is a junction number, because it is equal to n+sod(n) for n = 999693 and 999702.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999738.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 27753 + ... + 27788.

2⁹⁹⁹⁷³⁸ is an apocalyptic number.

999738 is an abundant number, since it is smaller than the sum of its proper divisors (1166400).

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

999738 is a wasteful number, since it uses less digits than its factorization.

999738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55549 (or 55546 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 999738 is about 999.8689914184. The cubic root of 999738 is about 99.9912659038.

The spelling of 999738 in words is "nine hundred ninety-nine thousand, seven hundred thirty-eight".