1899854749 has 4 divisors (see below), whose sum is σ = 2045997436. Its totient is φ = 1753712064.

The previous prime is 1899854741. The next prime is 1899854753. The reversal of 1899854749 is 9474589981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9474589981 = 181 ⋅52345801.

It can be written as a sum of positive squares in 2 ways, for example, as 699232249 + 1200622500 = 26443^2 + 34650^2 .

It is not a de Polignac number, because 1899854749 - 2³ = 1899854741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1899854741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73071324 + ... + 73071349.

It is an arithmetic number, because the mean of its divisors is an integer number (511499359).

Almost surely, 2^1899854749 is an apocalyptic number.

It is an amenable number.

1899854749 is a deficient number, since it is larger than the sum of its proper divisors (146142687).

1899854749 is a wasteful number, since it uses less digits than its factorization.

1899854749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146142686.

The product of its digits is 26127360, while the sum is 64.

The square root of 1899854749 is about 43587.3232603242. The cubic root of 1899854749 is about 1238.5307669983.

The spelling of 1899854749 in words is "one billion, eight hundred ninety-nine million, eight hundred fifty-four thousand, seven hundred forty-nine".