1305428 has 12 divisors (see below), whose sum is σ = 2319072. Its totient is φ = 642840.

The previous prime is 1305427. The next prime is 1305431. The reversal of 1305428 is 8245031.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305427) 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, 2168 + ... + 2703.

It is an arithmetic number, because the mean of its divisors is an integer number (193256).

2^1305428 is an apocalyptic number.

It is an amenable number.

1305428 is a deficient number, since it is larger than the sum of its proper divisors (1013644).

1305428 is a wasteful number, since it uses less digits than its factorization.

1305428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4942 (or 4940 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1305428 is about 1142.5532810333. The cubic root of 1305428 is about 109.2909768840.

The spelling of 1305428 in words is "one million, three hundred five thousand, four hundred twenty-eight".