2154578 has 4 divisors (see below), whose sum is σ = 3231870. Its totient is φ = 1077288.

The previous prime is 2154577. The next prime is 2154587. The reversal of 2154578 is 8754512.

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., 2007889 + 146689 = 1417^2 + 383^2 .

It is not an unprimeable number, because it can be changed into a prime (2154577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 538643 + ... + 538646.

2^2154578 is an apocalyptic number.

2154578 is a deficient number, since it is larger than the sum of its proper divisors (1077292).

2154578 is a wasteful number, since it uses less digits than its factorization.

2154578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077291.

The product of its digits is 11200, while the sum is 32.

The square root of 2154578 is about 1467.8480847826. The cubic root of 2154578 is about 129.1578301736.

The spelling of 2154578 in words is "two million, one hundred fifty-four thousand, five hundred seventy-eight".