11861998 has 8 divisors (see below), whose sum is σ = 17877960. Its totient is φ = 5902680.

The previous prime is 11861987. The next prime is 11862007. The reversal of 11861998 is 89916811.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13633 + ... + 14476.

It is an arithmetic number, because the mean of its divisors is an integer number (2234745).

Almost surely, 2^11861998 is an apocalyptic number.

11861998 is a deficient number, since it is larger than the sum of its proper divisors (6015962).

11861998 is a wasteful number, since it uses less digits than its factorization.

11861998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28322.

The product of its digits is 31104, while the sum is 43.

The square root of 11861998 is about 3444.1251429064. The cubic root of 11861998 is about 228.0618355930.

The spelling of 11861998 in words is "eleven million, eight hundred sixty-one thousand, nine hundred ninety-eight".