1999279072 has 48 divisors (see below), whose sum is σ = 4516011360. Its totient is φ = 853475328.

The previous prime is 1999279069. The next prime is 1999279097. The reversal of 1999279072 is 2709729991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40204 + ... + 74932.

It is an arithmetic number, because the mean of its divisors is an integer number (94083570).

Almost surely, 2^1999279072 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 1999279072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2258005680).

1999279072 is an abundant number, since it is smaller than the sum of its proper divisors (2516732288).

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

1999279072 is a wasteful number, since it uses less digits than its factorization.

1999279072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35003 (or 34995 counting only the distinct ones).

The product of its (nonzero) digits is 1285956, while the sum is 55.

The square root of 1999279072 is about 44713.2986034356. The cubic root of 1999279072 is about 1259.7696463078.

It can be divided in two parts, 199927 and 9072, that multiplied together give a square (1813737744 = 42588²).

The spelling of 1999279072 in words is "one billion, nine hundred ninety-nine million, two hundred seventy-nine thousand, seventy-two".