1284224138 has 4 divisors (see below), whose sum is σ = 1926336210. Its totient is φ = 642112068.

The previous prime is 1284224131. The next prime is 1284224143. The reversal of 1284224138 is 8314224821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8314224821 = 7 ⋅1187746403.

It can be written as a sum of positive squares in only one way, i.e., 1281425209 + 2798929 = 35797^2 + 1673^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1284224098 and 1284224107.

It is not an unprimeable number, because it can be changed into a prime (1284224131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321056033 + ... + 321056036.

Almost surely, 2^1284224138 is an apocalyptic number.

1284224138 is a deficient number, since it is larger than the sum of its proper divisors (642112072).

1284224138 is an equidigital number, since it uses as much as digits as its factorization.

1284224138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642112071.

The product of its digits is 24576, while the sum is 35.

The square root of 1284224138 is about 35836.0731386685. The cubic root of 1284224138 is about 1086.9601179486.

Adding to 1284224138 its reverse (8314224821), we get a palindrome (9598448959).

The spelling of 1284224138 in words is "one billion, two hundred eighty-four million, two hundred twenty-four thousand, one hundred thirty-eight".