1388228 has 6 divisors (see below), whose sum is σ = 2429406. Its totient is φ = 694112.

The previous prime is 1388227. The next prime is 1388243. The reversal of 1388228 is 8228831.

It can be written as a sum of positive squares in only one way, i.e., 719104 + 669124 = 848^2 + 818^2 .

It is a super-4 number, since 4×1388228⁴ (a number of 26 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1388194 and 1388203.

It is not an unprimeable number, because it can be changed into a prime (1388227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173525 + ... + 173532.

It is an arithmetic number, because the mean of its divisors is an integer number (404901).

2^1388228 is an apocalyptic number.

It is an amenable number.

1388228 is a deficient number, since it is larger than the sum of its proper divisors (1041178).

1388228 is a wasteful number, since it uses less digits than its factorization.

1388228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347061 (or 347059 counting only the distinct ones).

The product of its digits is 6144, while the sum is 32.

The square root of 1388228 is about 1178.2308772053. The cubic root of 1388228 is about 111.5544587074.

The spelling of 1388228 in words is "one million, three hundred eighty-eight thousand, two hundred twenty-eight".