1871873145 has 80 divisors (see below), whose sum is σ = 3611942928. Its totient is φ = 923996160.

The previous prime is 1871873131. The next prime is 1871873149. The reversal of 1871873145 is 5413781781.

It can be written as a sum of positive squares in 8 ways, for example, as 27342441 + 1844530704 = 5229^2 + 42948^2 .

It is not a de Polignac number, because 1871873145 - 2¹⁴ = 1871856761 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1871873145.

It is not an unprimeable number, because it can be changed into a prime (1871873149) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 417757 + ... + 422213.

Almost surely, 2^1871873145 is an apocalyptic number.

1871873145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1871873145 is a deficient number, since it is larger than the sum of its proper divisors (1740069783).

1871873145 is a wasteful number, since it uses less digits than its factorization.

1871873145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4552 (or 4543 counting only the distinct ones).

The product of its digits is 188160, while the sum is 45.

The square root of 1871873145 is about 43265.1493121196. The cubic root of 1871873145 is about 1232.4201902111.

The spelling of 1871873145 in words is "one billion, eight hundred seventy-one million, eight hundred seventy-three thousand, one hundred forty-five".