1891375540 has 12 divisors (see below), whose sum is σ = 3971888676. Its totient is φ = 756550208.

The previous prime is 1891375529. The next prime is 1891375571. The reversal of 1891375540 is 455731981.

It can be written as a sum of positive squares in 2 ways, for example, as 850538896 + 1040836644 = 29164^2 + 32262^2 .

It is a congruent number.

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, 47284369 + ... + 47284408.

It is an arithmetic number, because the mean of its divisors is an integer number (330990723).

Almost surely, 2^1891375540 is an apocalyptic number.

1891375540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1891375540 is an abundant number, since it is smaller than the sum of its proper divisors (2080513136).

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

1891375540 is a wasteful number, since it uses less digits than its factorization.

1891375540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94568786 (or 94568784 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 43.

The square root of 1891375540 is about 43489.9475741234. The cubic root of 1891375540 is about 1236.6854639130.

The spelling of 1891375540 in words is "one billion, eight hundred ninety-one million, three hundred seventy-five thousand, five hundred forty".