999961977 has 8 divisors (see below), whose sum is σ = 1523751616. Its totient is φ = 571406832.

The previous prime is 999961943. The next prime is 999961979. The reversal of 999961977 is 779169999.

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

It is not a de Polignac number, because 999961977 - 2¹⁰ = 999960953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999961979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23808598 + ... + 23808639.

It is an arithmetic number, because the mean of its divisors is an integer number (190468952).

Almost surely, 2^999961977 is an apocalyptic number.

It is an amenable number.

999961977 is a deficient number, since it is larger than the sum of its proper divisors (523789639).

999961977 is a wasteful number, since it uses less digits than its factorization.

999961977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47617247.

The product of its digits is 17360406, while the sum is 66.

The square root of 999961977 is about 31622.1753995515. The cubic root of 999961977 is about 999.9873255060.

The spelling of 999961977 in words is "nine hundred ninety-nine million, nine hundred sixty-one thousand, nine hundred seventy-seven".