2153778 has 16 divisors (see below), whose sum is σ = 4699296. Its totient is φ = 652640.

The previous prime is 2153773. The next prime is 2153779. The reversal of 2153778 is 8773512.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2153773) 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, 16251 + ... + 16382.

It is an arithmetic number, because the mean of its divisors is an integer number (293706).

2^2153778 is an apocalyptic number.

2153778 is an abundant number, since it is smaller than the sum of its proper divisors (2545518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2153778 is a wasteful number, since it uses less digits than its factorization.

2153778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32649.

The product of its digits is 11760, while the sum is 33.

The square root of 2153778 is about 1467.5755517179. The cubic root of 2153778 is about 129.1418426569.

It can be divided in two parts, 215 and 3778, that added together give a palindrome (3993).

The spelling of 2153778 in words is "two million, one hundred fifty-three thousand, seven hundred seventy-eight".