1854238666 has 16 divisors (see below), whose sum is σ = 3232572480. Its totient is φ = 781204320.

The previous prime is 1854238657. The next prime is 1854238721. The reversal of 1854238666 is 6668324581.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1121595 + ... + 1123246.

It is an arithmetic number, because the mean of its divisors is an integer number (202035780).

Almost surely, 2^1854238666 is an apocalyptic number.

1854238666 is a deficient number, since it is larger than the sum of its proper divisors (1378333814).

1854238666 is a wasteful number, since it uses less digits than its factorization.

1854238666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2244909.

The product of its digits is 1658880, while the sum is 49.

The square root of 1854238666 is about 43060.8716353954. The cubic root of 1854238666 is about 1228.5378589542.

The spelling of 1854238666 in words is "one billion, eight hundred fifty-four million, two hundred thirty-eight thousand, six hundred sixty-six".