999742 has 8 divisors (see below), whose sum is σ = 1578600. Its totient is φ = 473544.

The previous prime is 999727. The next prime is 999749. The reversal of 999742 is 247999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 999695 and 999704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13117 + ... + 13192.

It is an arithmetic number, because the mean of its divisors is an integer number (197325).

2⁹⁹⁹⁷⁴² is an apocalyptic number.

999742 is a deficient number, since it is larger than the sum of its proper divisors (578858).

999742 is a wasteful number, since it uses less digits than its factorization.

999742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26330.

The product of its digits is 40824, while the sum is 40.

The square root of 999742 is about 999.8709916784. The cubic root of 999742 is about 99.9913992603.

The spelling of 999742 in words is "nine hundred ninety-nine thousand, seven hundred forty-two".