2267978 has 4 divisors (see below), whose sum is σ = 3401970. Its totient is φ = 1133988.

The previous prime is 2267977. The next prime is 2267981. The reversal of 2267978 is 8797622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8797622 = 2 ⋅4398811.

It can be written as a sum of positive squares in only one way, i.e., 2024929 + 243049 = 1423^2 + 493^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2267971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 566993 + ... + 566996.

2^2267978 is an apocalyptic number.

2267978 is a deficient number, since it is larger than the sum of its proper divisors (1133992).

2267978 is a wasteful number, since it uses less digits than its factorization.

2267978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133991.

The product of its digits is 84672, while the sum is 41.

The square root of 2267978 is about 1505.9807435688. The cubic root of 2267978 is about 131.3851493742.

The spelling of 2267978 in words is "two million, two hundred sixty-seven thousand, nine hundred seventy-eight".