1228420169 has 4 divisors (see below), whose sum is σ = 1243220496. Its totient is φ = 1213619844.

The previous prime is 1228420163. The next prime is 1228420177. The reversal of 1228420169 is 9610248221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1228420169 is a prime.

It is a super-2 number, since 2×1228420169² = 3018032223211977122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1228420163) 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, 7400039 + ... + 7400204.

It is an arithmetic number, because the mean of its divisors is an integer number (310805124).

Almost surely, 2^1228420169 is an apocalyptic number.

It is an amenable number.

1228420169 is a deficient number, since it is larger than the sum of its proper divisors (14800327).

1228420169 is an equidigital number, since it uses as much as digits as its factorization.

1228420169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14800326.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 1228420169 is about 35048.8255010064. The cubic root of 1228420169 is about 1070.9823479134.

The spelling of 1228420169 in words is "one billion, two hundred twenty-eight million, four hundred twenty thousand, one hundred sixty-nine".