990869 has 12 divisors (see below), whose sum is σ = 1149120. Its totient is φ = 851400.

The previous prime is 990851. The next prime is 990881. The reversal of 990869 is 968099.

It is a de Polignac number, because none of the positive numbers 2^k-990869 is a prime.

It is a super-2 number, since 2×990869² = 1963642750322, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2084 + ... + 2514.

It is an arithmetic number, because the mean of its divisors is an integer number (95760).

2⁹⁹⁰⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

990869 is a deficient number, since it is larger than the sum of its proper divisors (158251).

990869 is a wasteful number, since it uses less digits than its factorization.

990869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 461 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 990869 is about 995.4240302504. The cubic root of 990869 is about 99.6947022145.

The spelling of 990869 in words is "nine hundred ninety thousand, eight hundred sixty-nine".