1225428 has 24 divisors (see below), whose sum is σ = 3028032. Its totient is φ = 384384.

The previous prime is 1225409. The next prime is 1225459. The reversal of 1225428 is 8245221.

It is a junction number, because it is equal to n+sod(n) for n = 1225398 and 1225407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2800 + ... + 3207.

It is an arithmetic number, because the mean of its divisors is an integer number (126168).

2^1225428 is an apocalyptic number.

It is an amenable number.

1225428 is an abundant number, since it is smaller than the sum of its proper divisors (1802604).

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

1225428 is a wasteful number, since it uses less digits than its factorization.

1225428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6031 (or 6029 counting only the distinct ones).

The product of its digits is 1280, while the sum is 24.

The square root of 1225428 is about 1106.9905148645. The cubic root of 1225428 is about 107.0112079563.

It can be divided in two parts, 1225 and 428, that added together give a triangular number (1653 = T₅₇).

The spelling of 1225428 in words is "one million, two hundred twenty-five thousand, four hundred twenty-eight".