1228737 has 4 divisors (see below), whose sum is σ = 1638320. Its totient is φ = 819156.

The previous prime is 1228693. The next prime is 1228741. The reversal of 1228737 is 7378221.

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 not a de Polignac number, because 1228737 - 2¹⁰ = 1227713 is a prime.

It is a D-number.

It is a Duffinian number.

1228737 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1228537) 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, 204787 + ... + 204792.

It is an arithmetic number, because the mean of its divisors is an integer number (409580).

2^1228737 is an apocalyptic number.

It is an amenable number.

1228737 is a deficient number, since it is larger than the sum of its proper divisors (409583).

1228737 is an equidigital number, since it uses as much as digits as its factorization.

1228737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409582.

The product of its digits is 4704, while the sum is 30.

The square root of 1228737 is about 1108.4841000213. The cubic root of 1228737 is about 107.1074415011.

The spelling of 1228737 in words is "one million, two hundred twenty-eight thousand, seven hundred thirty-seven".