990990143 has 12 divisors (see below), whose sum is σ = 1170639288. Its totient is φ = 831598560.

The previous prime is 990990127. The next prime is 990990149. The reversal of 990990143 is 341099099.

It is not a de Polignac number, because 990990143 - 2⁴ = 990990127 is a prime.

It is a super-2 number, since 2×990990143² = 1964122927046320898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 990990094 and 990990103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990990149) 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, 264680 + ... + 268397.

It is an arithmetic number, because the mean of its divisors is an integer number (97553274).

Almost surely, 2^990990143 is an apocalyptic number.

990990143 is a deficient number, since it is larger than the sum of its proper divisors (179649145).

990990143 is a wasteful number, since it uses less digits than its factorization.

990990143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533114 (or 533101 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 990990143 is about 31479.9959180429. The cubic root of 990990143 is about 996.9876491875.

The spelling of 990990143 in words is "nine hundred ninety million, nine hundred ninety thousand, one hundred forty-three".