2150978 has 4 divisors (see below), whose sum is σ = 3226470. Its totient is φ = 1075488.

The previous prime is 2150977. The next prime is 2151001. The reversal of 2150978 is 8790512.

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., 2140369 + 10609 = 1463^2 + 103^2 .

It is not an unprimeable number, because it can be changed into a prime (2150977) 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, 537743 + ... + 537746.

2^2150978 is an apocalyptic number.

2150978 is a deficient number, since it is larger than the sum of its proper divisors (1075492).

2150978 is a wasteful number, since it uses less digits than its factorization.

2150978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075491.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 2150978 is about 1466.6212871768. The cubic root of 2150978 is about 129.0858551519.

The spelling of 2150978 in words is "two million, one hundred fifty thousand, nine hundred seventy-eight".