1887089749 has 2 divisors, whose sum is σ = 1887089750. Its totient is φ = 1887089748.

The previous prime is 1887089723. The next prime is 1887089767. The reversal of 1887089749 is 9479807881.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1627557649 + 259532100 = 40343^2 + 16110^2 .

It is an emirp because it is prime and its reverse (9479807881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1887089749 - 2¹¹ = 1887087701 is a prime.

It is a super-2 number, since 2×1887089749² = 7122215441561766002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1887089719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 943544874 + 943544875.

It is an arithmetic number, because the mean of its divisors is an integer number (943544875).

Almost surely, 2^1887089749 is an apocalyptic number.

It is an amenable number.

1887089749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1887089749 is an equidigital number, since it uses as much as digits as its factorization.

1887089749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8128512, while the sum is 61.

The square root of 1887089749 is about 43440.6462774209. The cubic root of 1887089749 is about 1235.7506621063.

The spelling of 1887089749 in words is "one billion, eight hundred eighty-seven million, eighty-nine thousand, seven hundred forty-nine".