1222787890 has 8 divisors (see below), whose sum is σ = 2201018220. Its totient is φ = 489115152.

The previous prime is 1222787869. The next prime is 1222787897. The reversal of 1222787890 is 987872221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1219615929 + 3171961 = 34923^2 + 1781^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1222787890.

It is not an unprimeable number, because it can be changed into a prime (1222787897) 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, 61139385 + ... + 61139404.

Almost surely, 2^1222787890 is an apocalyptic number.

1222787890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1222787890 is a deficient number, since it is larger than the sum of its proper divisors (978230330).

1222787890 is a wasteful number, since it uses less digits than its factorization.

1222787890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122278796.

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 1222787890 is about 34968.3841491139. The cubic root of 1222787890 is about 1069.3430299055.

The spelling of 1222787890 in words is "one billion, two hundred twenty-two million, seven hundred eighty-seven thousand, eight hundred ninety".