1213428 has 12 divisors (see below), whose sum is σ = 2831360. Its totient is φ = 404472.

The previous prime is 1213427. The next prime is 1213439. The reversal of 1213428 is 8243121.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1213428² = 2944815022368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213427) 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, 50548 + ... + 50571.

2^1213428 is an apocalyptic number.

It is an amenable number.

1213428 is an abundant number, since it is smaller than the sum of its proper divisors (1617932).

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

1213428 is a wasteful number, since it uses less digits than its factorization.

1213428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101126 (or 101124 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

The square root of 1213428 is about 1101.5570797739. The cubic root of 1213428 is about 106.6607592214.

Adding to 1213428 its reverse (8243121), we get a palindrome (9456549).

The spelling of 1213428 in words is "one million, two hundred thirteen thousand, four hundred twenty-eight".