2143978 has 8 divisors (see below), whose sum is σ = 3225060. Its totient is φ = 1068960.

The previous prime is 2143969. The next prime is 2143993. The reversal of 2143978 is 8793412.

2143978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1787569 + 356409 = 1337^2 + 597^2 .

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

It is an Ulam number.

It is a d-powerful number, because it can be written as 2²¹ + 1 + 4⁷ + 3⁸ + 9⁴ + 7⁵ + 8³ .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 493 + ... + 2128.

2^2143978 is an apocalyptic number.

2143978 is a deficient number, since it is larger than the sum of its proper divisors (1081082).

2143978 is a wasteful number, since it uses less digits than its factorization.

2143978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3032.

The product of its digits is 12096, while the sum is 34.

The square root of 2143978 is about 1464.2329049711. The cubic root of 2143978 is about 128.9456734968.

The spelling of 2143978 in words is "two million, one hundred forty-three thousand, nine hundred seventy-eight".