1989171942 has 16 divisors (see below), whose sum is σ = 3978830592. Its totient is φ = 662976200.

The previous prime is 1989171937. The next prime is 1989171953. The reversal of 1989171942 is 2491719891.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53503 + ... + 82709.

It is an arithmetic number, because the mean of its divisors is an integer number (248676912).

Almost surely, 2^1989171942 is an apocalyptic number.

1989171942 is an abundant number, since it is smaller than the sum of its proper divisors (1989658650).

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

1989171942 is a wasteful number, since it uses less digits than its factorization.

1989171942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40563.

The product of its digits is 326592, while the sum is 51.

The square root of 1989171942 is about 44600.1338787228. The cubic root of 1989171942 is about 1257.6431844251.

The spelling of 1989171942 in words is "one billion, nine hundred eighty-nine million, one hundred seventy-one thousand, nine hundred forty-two".