1872720867 has 12 divisors (see below), whose sum is σ = 2652482456. Its totient is φ = 1175040000.

The previous prime is 1872720859. The next prime is 1872720869. The reversal of 1872720867 is 7680272781.

It is a happy number.

It is not a de Polignac number, because 1872720867 - 2³ = 1872720859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1872720869) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1079134 + ... + 1080867.

Almost surely, 2^1872720867 is an apocalyptic number.

1872720867 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1872720867 is a deficient number, since it is larger than the sum of its proper divisors (779761589).

1872720867 is a wasteful number, since it uses less digits than its factorization.

1872720867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2160038 (or 2160021 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 48.

The square root of 1872720867 is about 43274.9450259616. The cubic root of 1872720867 is about 1232.6062056715.

The spelling of 1872720867 in words is "one billion, eight hundred seventy-two million, seven hundred twenty thousand, eight hundred sixty-seven".