1834721861 has 8 divisors (see below), whose sum is σ = 2097098304. Its totient is φ = 1572413760.

The previous prime is 1834721851. The next prime is 1834721881. The reversal of 1834721861 is 1681274381.

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

It is a cyclic number.

It is not a de Polignac number, because 1834721861 - 2¹⁸ = 1834459717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1834721851) 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, 70166 + ... + 92696.

It is an arithmetic number, because the mean of its divisors is an integer number (262137288).

Almost surely, 2^1834721861 is an apocalyptic number.

It is an amenable number.

1834721861 is a deficient number, since it is larger than the sum of its proper divisors (262376443).

1834721861 is a wasteful number, since it uses less digits than its factorization.

1834721861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34171.

The product of its digits is 64512, while the sum is 41.

The square root of 1834721861 is about 42833.6533697512. The cubic root of 1834721861 is about 1224.2123185037.

The spelling of 1834721861 in words is "one billion, eight hundred thirty-four million, seven hundred twenty-one thousand, eight hundred sixty-one".