2133778 has 4 divisors (see below), whose sum is σ = 3200670. Its totient is φ = 1066888.

The previous prime is 2133773. The next prime is 2133793. The reversal of 2133778 is 8773312.

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

It can be written as a sum of positive squares in only one way, i.e., 2082249 + 51529 = 1443^2 + 227^2 .

It is not an unprimeable number, because it can be changed into a prime (2133773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533443 + ... + 533446.

2^2133778 is an apocalyptic number.

2133778 is a deficient number, since it is larger than the sum of its proper divisors (1066892).

2133778 is a wasteful number, since it uses less digits than its factorization.

2133778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066891.

The product of its digits is 7056, while the sum is 31.

The square root of 2133778 is about 1460.7456999766. The cubic root of 2133778 is about 128.7408615124.

The spelling of 2133778 in words is "two million, one hundred thirty-three thousand, seven hundred seventy-eight".