1813720887 has 48 divisors (see below), whose sum is σ = 2914229760. Its totient is φ = 1077753600.

The previous prime is 1813720861. The next prime is 1813720903. The reversal of 1813720887 is 7880273181.

It is not a de Polignac number, because 1813720887 - 2⁶ = 1813720823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813720847) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1797039 + ... + 1798047.

It is an arithmetic number, because the mean of its divisors is an integer number (60713120).

Almost surely, 2^1813720887 is an apocalyptic number.

1813720887 is a deficient number, since it is larger than the sum of its proper divisors (1100508873).

1813720887 is a wasteful number, since it uses less digits than its factorization.

1813720887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364 (or 1361 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 45.

The square root of 1813720887 is about 42587.8020916788. The cubic root of 1813720887 is about 1219.5234381172.

The spelling of 1813720887 in words is "one billion, eight hundred thirteen million, seven hundred twenty thousand, eight hundred eighty-seven".