1820961827 has 4 divisors (see below), whose sum is σ = 1821191136. Its totient is φ = 1820732520.

The previous prime is 1820961761. The next prime is 1820961841. The reversal of 1820961827 is 7281690281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7281690281 = 113 ⋅64439737.

It is a cyclic number.

It is not a de Polignac number, because 1820961827 - 2¹² = 1820957731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1820961887) 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, 102299 + ... + 118772.

It is an arithmetic number, because the mean of its divisors is an integer number (455297784).

Almost surely, 2^1820961827 is an apocalyptic number.

1820961827 is a deficient number, since it is larger than the sum of its proper divisors (229309).

1820961827 is an equidigital number, since it uses as much as digits as its factorization.

1820961827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229308.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 1820961827 is about 42672.7293127590. The cubic root of 1820961827 is about 1221.1441892733.

The spelling of 1820961827 in words is "one billion, eight hundred twenty million, nine hundred sixty-one thousand, eight hundred twenty-seven".