2261978 has 8 divisors (see below), whose sum is σ = 3439668. Its totient is φ = 1115424.

The previous prime is 2261933. The next prime is 2261993. The reversal of 2261978 is 8791622.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2122849 + 139129 = 1457^2 + 373^2 .

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

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, 7601 + ... + 7892.

2^2261978 is an apocalyptic number.

2261978 is a deficient number, since it is larger than the sum of its proper divisors (1177690).

2261978 is a wasteful number, since it uses less digits than its factorization.

2261978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15568.

The product of its digits is 12096, while the sum is 35.

The square root of 2261978 is about 1503.9873669682. The cubic root of 2261978 is about 131.2691860086.

The spelling of 2261978 in words is "two million, two hundred sixty-one thousand, nine hundred seventy-eight".