1228140 has 36 divisors (see below), whose sum is σ = 3725904. Its totient is φ = 327456.

The previous prime is 1228133. The next prime is 1228147. The reversal of 1228140 is 418221.

It is an interprime number because it is at equal distance from previous prime (1228133) and next prime (1228147).

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-3 number, since 3×1228140³ = 5557313332467432000, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1228147) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3232 + ... + 3591.

2^1228140 is an apocalyptic number.

1228140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1228140 is an abundant number, since it is smaller than the sum of its proper divisors (2497764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1228140 is a wasteful number, since it uses less digits than its factorization.

1228140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6838 (or 6833 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1228140 is about 1108.2147806269. The cubic root of 1228140 is about 107.0900921141.

It can be divided in two parts, 12281 and 40, that added together give a palindrome (12321).

The spelling of 1228140 in words is "one million, two hundred twenty-eight thousand, one hundred forty".