2222978 has 4 divisors (see below), whose sum is σ = 3334470. Its totient is φ = 1111488.

The previous prime is 2222977. The next prime is 2223007. The reversal of 2222978 is 8792222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8792222 = 2 ⋅4396111.

It can be written as a sum of positive squares in only one way, i.e., 1923769 + 299209 = 1387^2 + 547^2 .

It is a d-powerful number, because it can be written as 2⁴ + 2⁹ + 2¹⁰ + 2²¹ + 9⁴ + 7⁶ + 8² .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2222977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555743 + ... + 555746.

2^2222978 is an apocalyptic number.

2222978 is a deficient number, since it is larger than the sum of its proper divisors (1111492).

2222978 is a wasteful number, since it uses less digits than its factorization.

2222978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111491.

The product of its digits is 8064, while the sum is 32.

The square root of 2222978 is about 1490.9654590231. The cubic root of 2222978 is about 130.5103802120.

The spelling of 2222978 in words is "two million, two hundred twenty-two thousand, nine hundred seventy-eight".