2129853478 has 4 divisors (see below), whose sum is σ = 3194780220. Its totient is φ = 1064926738.

The previous prime is 2129853463. The next prime is 2129853487. The reversal of 2129853478 is 8743589212.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 532463368 + ... + 532463371.

It is an arithmetic number, because the mean of its divisors is an integer number (798695055).

Almost surely, 2^2129853478 is an apocalyptic number.

2129853478 is a deficient number, since it is larger than the sum of its proper divisors (1064926742).

2129853478 is a wasteful number, since it uses less digits than its factorization.

2129853478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064926741.

The product of its digits is 967680, while the sum is 49.

The square root of 2129853478 is about 46150.3356217482. The cubic root of 2129853478 is about 1286.6188478415.

The spelling of 2129853478 in words is "two billion, one hundred twenty-nine million, eight hundred fifty-three thousand, four hundred seventy-eight".