1840134891 has 16 divisors (see below), whose sum is σ = 2818112000. Its totient is φ = 1046219328.

The previous prime is 1840134889. The next prime is 1840134937. The reversal of 1840134891 is 1984310481.

It is not a de Polignac number, because 1840134891 - 2¹ = 1840134889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1840134811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215986 + ... + 224343.

It is an arithmetic number, because the mean of its divisors is an integer number (176132000).

Almost surely, 2^1840134891 is an apocalyptic number.

1840134891 is a deficient number, since it is larger than the sum of its proper divisors (977977109).

1840134891 is a wasteful number, since it uses less digits than its factorization.

1840134891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440538.

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 1840134891 is about 42896.7934815646. The cubic root of 1840134891 is about 1225.4150787752.

The spelling of 1840134891 in words is "one billion, eight hundred forty million, one hundred thirty-four thousand, eight hundred ninety-one".