1228187423 has 4 divisors (see below), whose sum is σ = 1300433760. Its totient is φ = 1155941088.

The previous prime is 1228187413. The next prime is 1228187449. The reversal of 1228187423 is 3247818221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1228187423 - 2⁴ = 1228187407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228187413) 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, 36123143 + ... + 36123176.

It is an arithmetic number, because the mean of its divisors is an integer number (325108440).

Almost surely, 2^1228187423 is an apocalyptic number.

1228187423 is a deficient number, since it is larger than the sum of its proper divisors (72246337).

1228187423 is an equidigital number, since it uses as much as digits as its factorization.

1228187423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72246336.

The product of its digits is 43008, while the sum is 38.

The square root of 1228187423 is about 35045.5050327428. The cubic root of 1228187423 is about 1070.9147047708.

The spelling of 1228187423 in words is "one billion, two hundred twenty-eight million, one hundred eighty-seven thousand, four hundred twenty-three".