999855854 has 4 divisors (see below), whose sum is σ = 1499783784. Its totient is φ = 499927926.

The previous prime is 999855853. The next prime is 999855859. The reversal of 999855854 is 458558999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 458558999 = 15233 ⋅30103.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999855851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249963962 + ... + 249963965.

It is an arithmetic number, because the mean of its divisors is an integer number (374945946).

Almost surely, 2^999855854 is an apocalyptic number.

999855854 is a deficient number, since it is larger than the sum of its proper divisors (499927930).

999855854 is a wasteful number, since it uses less digits than its factorization.

999855854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499927929.

The product of its digits is 23328000, while the sum is 62.

The square root of 999855854 is about 31620.4973711673. The cubic root of 999855854 is about 999.9519490245.

The spelling of 999855854 in words is "nine hundred ninety-nine million, eight hundred fifty-five thousand, eight hundred fifty-four".