1183987990 has 32 divisors (see below), whose sum is σ = 2156046336. Its totient is φ = 468102240.

The previous prime is 1183987969. The next prime is 1183988023. The reversal of 1183987990 is 997893811.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 309429 + ... + 313231.

It is an arithmetic number, because the mean of its divisors is an integer number (67376448).

Almost surely, 2^1183987990 is an apocalyptic number.

1183987990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1183987990 is a deficient number, since it is larger than the sum of its proper divisors (972058346).

1183987990 is a wasteful number, since it uses less digits than its factorization.

1183987990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4164.

The product of its (nonzero) digits is 979776, while the sum is 55.

The square root of 1183987990 is about 34409.1265509603. The cubic root of 1183987990 is about 1057.9109175129.

The spelling of 1183987990 in words is "one billion, one hundred eighty-three million, nine hundred eighty-seven thousand, nine hundred ninety".