1889901729 has 27 divisors (see below), whose sum is σ = 2803137363. Its totient is φ = 1226981952.

The previous prime is 1889901721. The next prime is 1889901737. The reversal of 1889901729 is 9271099881.

The square root of 1889901729 is 43473.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (1889901721) and next prime (1889901737).

It can be written as a sum of positive squares in only one way, i.e., 509630625 + 1380271104 = 22575^2 + 37152^2 .

It is not a de Polignac number, because 1889901729 - 2³ = 1889901721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1889901721) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5607849 + ... + 5608185.

Almost surely, 2^1889901729 is an apocalyptic number.

1889901729 is the 43473-rd square number.

1889901729 is the 21737-th centered octagonal number.

It is an amenable number.

1889901729 is a deficient number, since it is larger than the sum of its proper divisors (913235634).

1889901729 is an frugal number, since it uses more digits than its factorization.

1889901729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 54.

The cubic root of 1889901729 is about 1236.3641608501.

The spelling of 1889901729 in words is "one billion, eight hundred eighty-nine million, nine hundred one thousand, seven hundred twenty-nine".