999278742 has 192 divisors, whose sum is σ = 2696601600. Its totient is φ = 240926400.

The previous prime is 999278741. The next prime is 999278807. The reversal of 999278742 is 247872999.

It is a Harshad number since it is a multiple of its sum of digits (57).

Its product of digits (4572288) is a multiple of the sum of its prime divisors (252).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999278741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7628017 + ... + 7628147.

It is an arithmetic number, because the mean of its divisors is an integer number (14044800).

Almost surely, 2^999278742 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999278742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1348300800).

999278742 is an abundant number, since it is smaller than the sum of its proper divisors (1697322858).

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

999278742 is a wasteful number, since it uses less digits than its factorization.

999278742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263 (or 252 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 57.

The square root of 999278742 is about 31611.3704543160. The cubic root of 999278742 is about 999.7595228420.

The spelling of 999278742 in words is "nine hundred ninety-nine million, two hundred seventy-eight thousand, seven hundred forty-two".