19861042 has 8 divisors (see below), whose sum is σ = 31359600. Its totient is φ = 9407844.

The previous prime is 19861033. The next prime is 19861063. The reversal of 19861042 is 24016891.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 19860995 and 19861013.

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, 261292 + ... + 261367.

It is an arithmetic number, because the mean of its divisors is an integer number (3919950).

Almost surely, 2^19861042 is an apocalyptic number.

19861042 is a deficient number, since it is larger than the sum of its proper divisors (11498558).

19861042 is a wasteful number, since it uses less digits than its factorization.

19861042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522680.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 19861042 is about 4456.5728985399. The cubic root of 19861042 is about 270.8116500090.

The spelling of 19861042 in words is "nineteen million, eight hundred sixty-one thousand, forty-two".