1870827921 has 10 divisors (see below), whose sum is σ = 2794693682. Its totient is φ = 1247218560.

The previous prime is 1870827901. The next prime is 1870827923. The reversal of 1870827921 is 1297280781.

It can be written as a sum of positive squares in only one way, i.e., 1869351696 + 1476225 = 43236^2 + 1215^2 .

It is not a de Polignac number, because 1870827921 - 2³⁰ = 797086097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1870827923) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 11548240 + ... + 11548401.

Almost surely, 2^1870827921 is an apocalyptic number.

It is an amenable number.

1870827921 is a deficient number, since it is larger than the sum of its proper divisors (923865761).

1870827921 is an equidigital number, since it uses as much as digits as its factorization.

1870827921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23096653 (or 23096644 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 45.

The square root of 1870827921 is about 43253.0683420263. The cubic root of 1870827921 is about 1232.1907596003.

The spelling of 1870827921 in words is "one billion, eight hundred seventy million, eight hundred twenty-seven thousand, nine hundred twenty-one".