1228493621 has 16 divisors (see below), whose sum is σ = 1339915200. Its totient is φ = 1121879808.

The previous prime is 1228493599. The next prime is 1228493633. The reversal of 1228493621 is 1263948221.

It is a cyclic number.

It is not a de Polignac number, because 1228493621 - 2²² = 1224299317 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 (1228493821) 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, 432221 + ... + 435053.

It is an arithmetic number, because the mean of its divisors is an integer number (83744700).

Almost surely, 2^1228493621 is an apocalyptic number.

It is an amenable number.

1228493621 is a deficient number, since it is larger than the sum of its proper divisors (111421579).

1228493621 is a wasteful number, since it uses less digits than its factorization.

1228493621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3668.

The product of its digits is 41472, while the sum is 38.

The square root of 1228493621 is about 35049.8733378596. The cubic root of 1228493621 is about 1071.0036935489.

The spelling of 1228493621 in words is "one billion, two hundred twenty-eight million, four hundred ninety-three thousand, six hundred twenty-one".