1871689652 has 18 divisors (see below), whose sum is σ = 3810225762. Its totient is φ = 802152624.

The previous prime is 1871689649. The next prime is 1871689679. The reversal of 1871689652 is 2569861781.

It can be written as a sum of positive squares in only one way, i.e., 1655187856 + 216501796 = 40684^2 + 14714^2 .

It is a super-2 number, since 2×1871689652² = 7006444306807762208, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1871689594 and 1871689603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4774523 + ... + 4774914.

It is an arithmetic number, because the mean of its divisors is an integer number (211679209).

Almost surely, 2^1871689652 is an apocalyptic number.

It is an amenable number.

1871689652 is an abundant number, since it is smaller than the sum of its proper divisors (1938536110).

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

1871689652 is a wasteful number, since it uses less digits than its factorization.

1871689652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9549455 (or 9549446 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 53.

The square root of 1871689652 is about 43263.0286965672. The cubic root of 1871689652 is about 1232.3799189872.

The spelling of 1871689652 in words is "one billion, eight hundred seventy-one million, six hundred eighty-nine thousand, six hundred fifty-two".