1999042686 has 32 divisors (see below), whose sum is σ = 4508628480. Its totient is φ = 656400888.

The previous prime is 1999042667. The next prime is 1999042693. The reversal of 1999042686 is 6862409991.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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, 272646 + ... + 279881.

It is an arithmetic number, because the mean of its divisors is an integer number (140894640).

Almost surely, 2^1999042686 is an apocalyptic number.

1999042686 is an abundant number, since it is smaller than the sum of its proper divisors (2509585794).

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

1999042686 is a wasteful number, since it uses less digits than its factorization.

1999042686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552605 (or 552599 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The square root of 1999042686 is about 44710.6551730122. The cubic root of 1999042686 is about 1259.7199944693.

The spelling of 1999042686 in words is "one billion, nine hundred ninety-nine million, forty-two thousand, six hundred eighty-six".