1387228209 has 8 divisors (see below), whose sum is σ = 1946987040. Its totient is φ = 876144096.

The previous prime is 1387228189. The next prime is 1387228217. The reversal of 1387228209 is 9028227831.

It is a happy number.

1387228209 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1387228209 - 2⁷ = 1387228081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1387228009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12168612 + ... + 12168725.

It is an arithmetic number, because the mean of its divisors is an integer number (243373380).

Almost surely, 2^1387228209 is an apocalyptic number.

1387228209 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1387228209 is a deficient number, since it is larger than the sum of its proper divisors (559758831).

1387228209 is a wasteful number, since it uses less digits than its factorization.

1387228209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24337359.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 1387228209 is about 37245.5126021914. The cubic root of 1387228209 is about 1115.2767205823.

The spelling of 1387228209 in words is "one billion, three hundred eighty-seven million, two hundred twenty-eight thousand, two hundred nine".