999789974 has 8 divisors (see below), whose sum is σ = 1511493888. Its totient is φ = 495958680.

The previous prime is 999789953. The next prime is 999789983. The reversal of 999789974 is 479987999.

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

It is a super-2 number, since 2×999789974² = 1999159984221841352, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 999789898 and 999789907.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1967837 + ... + 1968344.

It is an arithmetic number, because the mean of its divisors is an integer number (188936736).

Almost surely, 2^999789974 is an apocalyptic number.

999789974 is a deficient number, since it is larger than the sum of its proper divisors (511703914).

999789974 is a wasteful number, since it uses less digits than its factorization.

999789974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3936310.

The product of its digits is 92588832, while the sum is 71.

The square root of 999789974 is about 31619.4556246625. The cubic root of 999789974 is about 999.9299864315.

The spelling of 999789974 in words is "nine hundred ninety-nine million, seven hundred eighty-nine thousand, nine hundred seventy-four".