991667842 has 24 divisors (see below), whose sum is σ = 1665893628. Its totient is φ = 442247520.

The previous prime is 991667837. The next prime is 991667867. The reversal of 991667842 is 248766199.

It is a happy number.

991667842 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 947962521 + 43705321 = 30789^2 + 6611^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 991667842.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25833 + ... + 51484.

Almost surely, 2^991667842 is an apocalyptic number.

991667842 is a deficient number, since it is larger than the sum of its proper divisors (674225786).

991667842 is a wasteful number, since it uses less digits than its factorization.

991667842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77394 (or 77383 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 52.

The square root of 991667842 is about 31490.7580410507. The cubic root of 991667842 is about 997.2148642201.

The spelling of 991667842 in words is "nine hundred ninety-one million, six hundred sixty-seven thousand, eight hundred forty-two".