1891593940 has 12 divisors (see below), whose sum is σ = 3972347316. Its totient is φ = 756637568.

The previous prime is 1891593901. The next prime is 1891593947. The reversal of 1891593940 is 493951981.

It can be written as a sum of positive squares in 2 ways, for example, as 284866884 + 1606727056 = 16878^2 + 40084^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891593947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47289829 + ... + 47289868.

It is an arithmetic number, because the mean of its divisors is an integer number (331028943).

Almost surely, 2^1891593940 is an apocalyptic number.

1891593940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1891593940 is an abundant number, since it is smaller than the sum of its proper divisors (2080753376).

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

1891593940 is a wasteful number, since it uses less digits than its factorization.

1891593940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94579706 (or 94579704 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 49.

The square root of 1891593940 is about 43492.4584267204. The cubic root of 1891593940 is about 1236.7330627292.

The spelling of 1891593940 in words is "one billion, eight hundred ninety-one million, five hundred ninety-three thousand, nine hundred forty".