1820136549 has 16 divisors (see below), whose sum is σ = 3025681920. Its totient is φ = 945525360.

The previous prime is 1820136517. The next prime is 1820136557. The reversal of 1820136549 is 9456310281.

It is not a de Polignac number, because 1820136549 - 2⁵ = 1820136517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820132549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3939459 + ... + 3939920.

It is an arithmetic number, because the mean of its divisors is an integer number (189105120).

Almost surely, 2^1820136549 is an apocalyptic number.

It is an amenable number.

1820136549 is a deficient number, since it is larger than the sum of its proper divisors (1205545371).

1820136549 is a wasteful number, since it uses less digits than its factorization.

1820136549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7879400.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 1820136549 is about 42663.0583643508. The cubic root of 1820136549 is about 1220.9596831690.

The spelling of 1820136549 in words is "one billion, eight hundred twenty million, one hundred thirty-six thousand, five hundred forty-nine".