999634690 has 8 divisors (see below), whose sum is σ = 1799342460. Its totient is φ = 399853872.

The previous prime is 999634687. The next prime is 999634703. The reversal of 999634690 is 96436999.

999634690 is digitally balanced in base 2 and base 6, because in such bases it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 31617²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 999634689 + 1 = 31617^2 + 1^2 .

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

It is a super-2 number, since 2×999634690² = 1998539026902792200, which contains 22 as substring.

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, 49981725 + ... + 49981744.

Almost surely, 2^999634690 is an apocalyptic number.

999634690 is a deficient number, since it is larger than the sum of its proper divisors (799707770).

999634690 is a wasteful number, since it uses less digits than its factorization.

999634690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99963476.

The product of its (nonzero) digits is 2834352, while the sum is 55.

The square root of 999634690 is about 31617.0000158143. Note that the first 4 decimals coincide. The cubic root of 999634690 is about 999.8782151691.

It can be divided in two parts, 99963 and 4690, that added together give a triangular number (104653 = T₄₅₇).

The spelling of 999634690 in words is "nine hundred ninety-nine million, six hundred thirty-four thousand, six hundred ninety".