2147978 has 8 divisors (see below), whose sum is σ = 3682272. Its totient is φ = 920556.

The previous prime is 2147941. The next prime is 2147987. The reversal of 2147978 is 8797412.

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

It is a super-2 number, since 2×2147978² = 9227618976968, which contains 22 as substring.

It is an Ulam number.

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, 76700 + ... + 76727.

It is an arithmetic number, because the mean of its divisors is an integer number (460284).

2^2147978 is an apocalyptic number.

2147978 is a deficient number, since it is larger than the sum of its proper divisors (1534294).

2147978 is a wasteful number, since it uses less digits than its factorization.

2147978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153436.

The product of its digits is 28224, while the sum is 38.

The square root of 2147978 is about 1465.5981713962. The cubic root of 2147978 is about 129.0258145962.

It can be divided in two parts, 2147 and 978, that added together give a 5-th power (3125 = 5⁵).

The spelling of 2147978 in words is "two million, one hundred forty-seven thousand, nine hundred seventy-eight".