1872171398 has 16 divisors (see below), whose sum is σ = 2870368704. Its totient is φ = 915414720.

The previous prime is 1872171391. The next prime is 1872171407. The reversal of 1872171398 is 8931712781.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1872171391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116636 + ... + 131712.

It is an arithmetic number, because the mean of its divisors is an integer number (179398044).

Almost surely, 2^1872171398 is an apocalyptic number.

1872171398 is a deficient number, since it is larger than the sum of its proper divisors (998197306).

1872171398 is a wasteful number, since it uses less digits than its factorization.

1872171398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16447.

The product of its digits is 169344, while the sum is 47.

The square root of 1872171398 is about 43268.5959790701. The cubic root of 1872171398 is about 1232.4856422066.

The spelling of 1872171398 in words is "one billion, eight hundred seventy-two million, one hundred seventy-one thousand, three hundred ninety-eight".