1305420 has 24 divisors (see below), whose sum is σ = 3655344. Its totient is φ = 348096.

The previous prime is 1305401. The next prime is 1305427. The reversal of 1305420 is 245031.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1305420.

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 7 ways as a sum of consecutive naturals, for example, 10819 + ... + 10938.

It is an arithmetic number, because the mean of its divisors is an integer number (152306).

2^1305420 is an apocalyptic number.

1305420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1305420 is an abundant number, since it is smaller than the sum of its proper divisors (2349924).

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

1305420 is a wasteful number, since it uses less digits than its factorization.

1305420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21769 (or 21767 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 1305420 is about 1142.5497800971. The cubic root of 1305420 is about 109.2907536291.

The spelling of 1305420 in words is "one million, three hundred five thousand, four hundred twenty".