1181487890 has 16 divisors (see below), whose sum is σ = 2320012800. Its totient is φ = 429631920.

The previous prime is 1181487877. The next prime is 1181487911. The reversal of 1181487890 is 987841811.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5370290 + ... + 5370509.

It is an arithmetic number, because the mean of its divisors is an integer number (145000800).

Almost surely, 2^1181487890 is an apocalyptic number.

1181487890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1181487890 is a deficient number, since it is larger than the sum of its proper divisors (1138524910).

1181487890 is a wasteful number, since it uses less digits than its factorization.

1181487890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10740817.

The product of its (nonzero) digits is 129024, while the sum is 47.

The square root of 1181487890 is about 34372.7783282062. The cubic root of 1181487890 is about 1057.1657672432.

The spelling of 1181487890 in words is "one billion, one hundred eighty-one million, four hundred eighty-seven thousand, eight hundred ninety".