1228376421 has 12 divisors (see below), whose sum is σ = 1840037472. Its totient is φ = 818917452.

The previous prime is 1228376419. The next prime is 1228376437. The reversal of 1228376421 is 1246738221.

It is a happy number.

1228376421 is a `hidden beast` number, since 1 + 2 + 2 + 8 + 3 + 7 + 642 + 1 = 666.

It is not a de Polignac number, because 1228376421 - 2¹ = 1228376419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228376411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2527281 + ... + 2527766.

It is an arithmetic number, because the mean of its divisors is an integer number (153336456).

Almost surely, 2^1228376421 is an apocalyptic number.

It is an amenable number.

1228376421 is a deficient number, since it is larger than the sum of its proper divisors (611661051).

1228376421 is an frugal number, since it uses more digits than its factorization.

1228376421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5055062 (or 5055050 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 1228376421 is about 35048.2013946508. The cubic root of 1228376421 is about 1070.9696340518.

The spelling of 1228376421 in words is "one billion, two hundred twenty-eight million, three hundred seventy-six thousand, four hundred twenty-one".