1854038221 has 16 divisors (see below), whose sum is σ = 2241026560. Its totient is φ = 1498376880.

The previous prime is 1854038201. The next prime is 1854038227. The reversal of 1854038221 is 1228304581.

It is a happy number.

It is not a de Polignac number, because 1854038221 - 2²⁵ = 1820483789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1854038227) 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, 4971 + ... + 61096.

It is an arithmetic number, because the mean of its divisors is an integer number (140064160).

Almost surely, 2^1854038221 is an apocalyptic number.

It is an amenable number.

1854038221 is a deficient number, since it is larger than the sum of its proper divisors (386988339).

1854038221 is a wasteful number, since it uses less digits than its factorization.

1854038221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66304.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 1854038221 is about 43058.5441114769. The cubic root of 1854038221 is about 1228.4935886472.

The spelling of 1854038221 in words is "one billion, eight hundred fifty-four million, thirty-eight thousand, two hundred twenty-one".