1903991429886 has 128 divisors (see below), whose sum is σ = 4957515601920. Its totient is φ = 473738969088.

The previous prime is 1903991429861. The next prime is 1903991429933. The reversal of 1903991429886 is 6889241993091.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a self number, because there is not a number n which added to its sum of digits gives 1903991429886.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 121731 + ... + 1955198.

It is an arithmetic number, because the mean of its divisors is an integer number (38730590640).

Almost surely, 2^{1903991429886} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1903991429886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2478757800960).

1903991429886 is an abundant number, since it is smaller than the sum of its proper divisors (3053524172034).

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

1903991429886 is a wasteful number, since it uses less digits than its factorization.

1903991429886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2077050.

The product of its (nonzero) digits is 60466176, while the sum is 69.

The spelling of 1903991429886 in words is "one trillion, nine hundred three billion, nine hundred ninety-one million, four hundred twenty-nine thousand, eight hundred eighty-six".