1871811494 has 16 divisors (see below), whose sum is σ = 3269364768. Its totient is φ = 787068672.

The previous prime is 1871811493. The next prime is 1871811509. The reversal of 1871811494 is 4941181781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1871811493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1260587 + ... + 1262070.

It is an arithmetic number, because the mean of its divisors is an integer number (204335298).

Almost surely, 2^1871811494 is an apocalyptic number.

1871811494 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1871811494 is a deficient number, since it is larger than the sum of its proper divisors (1397553274).

1871811494 is a wasteful number, since it uses less digits than its factorization.

1871811494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2522719.

The product of its digits is 64512, while the sum is 44.

The square root of 1871811494 is about 43264.4368274915. The cubic root of 1871811494 is about 1232.4066599546.

The spelling of 1871811494 in words is "one billion, eight hundred seventy-one million, eight hundred eleven thousand, four hundred ninety-four".