1228187421 has 16 divisors (see below), whose sum is σ = 1820589120. Its totient is φ = 818318160.

The previous prime is 1228187413. The next prime is 1228187449. The reversal of 1228187421 is 1247818221.

It is a happy number.

1228187421 is a `hidden beast` number, since 1 + 228 + 1 + 8 + 7 + 421 = 666.

It is not a de Polignac number, because 1228187421 - 2³ = 1228187413 is a prime.

It is a super-2 number, since 2×1228187421² = 3016888682205262482, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228187461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38026 + ... + 62468.

It is an arithmetic number, because the mean of its divisors is an integer number (113786820).

Almost surely, 2^1228187421 is an apocalyptic number.

It is an amenable number.

1228187421 is a deficient number, since it is larger than the sum of its proper divisors (592401699).

1228187421 is a wasteful number, since it uses less digits than its factorization.

1228187421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26313 (or 26307 counting only the distinct ones).

The product of its digits is 14336, while the sum is 36.

The square root of 1228187421 is about 35045.5050042085. The cubic root of 1228187421 is about 1070.9147041895.

The spelling of 1228187421 in words is "one billion, two hundred twenty-eight million, one hundred eighty-seven thousand, four hundred twenty-one".