222738779 has 4 divisors (see below), whose sum is σ = 228758784. Its totient is φ = 216718776.

The previous prime is 222738757. The next prime is 222738793. The reversal of 222738779 is 977837222.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 977837222 = 2 ⋅488918611.

It is a cyclic number.

It is not a de Polignac number, because 222738779 - 2¹² = 222734683 is a prime.

It is a super-2 number, since 2×222738779² = 99225127340821682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222738799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3009947 + ... + 3010020.

It is an arithmetic number, because the mean of its divisors is an integer number (57189696).

Almost surely, 2^222738779 is an apocalyptic number.

222738779 is a deficient number, since it is larger than the sum of its proper divisors (6020005).

222738779 is an equidigital number, since it uses as much as digits as its factorization.

222738779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6020004.

The product of its digits is 592704, while the sum is 47.

The square root of 222738779 is about 14924.4356342208. The cubic root of 222738779 is about 606.1758240775.

The spelling of 222738779 in words is "two hundred twenty-two million, seven hundred thirty-eight thousand, seven hundred seventy-nine".