2123578 has 8 divisors (see below), whose sum is σ = 3271572. Its totient is φ = 1033056.

The previous prime is 2123557. The next prime is 2123581. The reversal of 2123578 is 8753212.

It can be written as a sum of positive squares in 2 ways, for example, as 2122849 + 729 = 1457^2 + 27^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a d-powerful number, because it can be written as 2¹¹ + 1 + 2¹⁹ + 3¹³ + 5 + 7⁴ + 8³ .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14275 + ... + 14422.

2^2123578 is an apocalyptic number.

2123578 is a deficient number, since it is larger than the sum of its proper divisors (1147994).

2123578 is a wasteful number, since it uses less digits than its factorization.

2123578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28736.

The product of its digits is 3360, while the sum is 28.

The square root of 2123578 is about 1457.2501501115. The cubic root of 2123578 is about 128.5353957815.

It can be divided in two parts, 2123 and 578, that added together give a triangular number (2701 = T₇₃).

The spelling of 2123578 in words is "two million, one hundred twenty-three thousand, five hundred seventy-eight".