1890020811 has 8 divisors (see below), whose sum is σ = 2880031744. Its totient is φ = 1080011880.

The previous prime is 1890020807. The next prime is 1890020813. The reversal of 1890020811 is 1180200981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1890020811 - 2² = 1890020807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1890020813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45000475 + ... + 45000516.

It is an arithmetic number, because the mean of its divisors is an integer number (360003968).

Almost surely, 2^1890020811 is an apocalyptic number.

1890020811 is a deficient number, since it is larger than the sum of its proper divisors (990010933).

1890020811 is an equidigital number, since it uses as much as digits as its factorization.

1890020811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90001001.

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 1890020811 is about 43474.3695871487. The cubic root of 1890020811 is about 1236.3901279189.

The spelling of 1890020811 in words is "one billion, eight hundred ninety million, twenty thousand, eight hundred eleven".