990400099 has 16 divisors (see below), whose sum is σ = 1135360800. Its totient is φ = 856348416.

The previous prime is 990400069. The next prime is 990400111. The reversal of 990400099 is 990004099.

It is a cyclic number.

It is not a de Polignac number, because 990400099 - 2¹¹ = 990398051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990400069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 544 + ... + 44509.

It is an arithmetic number, because the mean of its divisors is an integer number (70960050).

Almost surely, 2^990400099 is an apocalyptic number.

990400099 is a deficient number, since it is larger than the sum of its proper divisors (144960701).

990400099 is a wasteful number, since it uses less digits than its factorization.

990400099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45174.

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 990400099 is about 31470.6227933290. The cubic root of 990400099 is about 996.7897382476.

It can be divided in two parts, 9904000 and 99, that added together give a palindrome (9904099).

The spelling of 990400099 in words is "nine hundred ninety million, four hundred thousand, ninety-nine".