11661870 has 32 divisors (see below), whose sum is σ = 30533760. Its totient is φ = 2827040.

The previous prime is 11661863. The next prime is 11661893. The reversal of 11661870 is 7816611.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 17340 + ... + 17999.

It is an arithmetic number, because the mean of its divisors is an integer number (954180).

Almost surely, 2^11661870 is an apocalyptic number.

11661870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11661870 is an abundant number, since it is smaller than the sum of its proper divisors (18871890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11661870 is a wasteful number, since it uses less digits than its factorization.

11661870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35360.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 11661870 is about 3414.9480230305. The cubic root of 11661870 is about 226.7719834502.

The spelling of 11661870 in words is "eleven million, six hundred sixty-one thousand, eight hundred seventy".