1189688890 has 32 divisors (see below), whose sum is σ = 2308561920. Its totient is φ = 438813504.

The previous prime is 1189688879. The next prime is 1189688977. The reversal of 1189688890 is 988869811.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137101 + ... + 145519.

It is an arithmetic number, because the mean of its divisors is an integer number (72142560).

Almost surely, 2^1189688890 is an apocalyptic number.

1189688890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1189688890 is a deficient number, since it is larger than the sum of its proper divisors (1118873030).

1189688890 is a wasteful number, since it uses less digits than its factorization.

1189688890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9526.

The product of its (nonzero) digits is 1990656, while the sum is 58.

The square root of 1189688890 is about 34491.8670123842. The cubic root of 1189688890 is about 1059.6061459524.

The spelling of 1189688890 in words is "one billion, one hundred eighty-nine million, six hundred eighty-eight thousand, eight hundred ninety".