1305640 has 32 divisors (see below), whose sum is σ = 3358080. Its totient is φ = 447552.

The previous prime is 1305637. The next prime is 1305643. The reversal of 1305640 is 465031.

It is an interprime number because it is at equal distance from previous prime (1305637) and next prime (1305643).

It is not an unprimeable number, because it can be changed into a prime (1305643) 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, 2052 + ... + 2611.

It is an arithmetic number, because the mean of its divisors is an integer number (104940).

2^1305640 is an apocalyptic number.

1305640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1305640 is an abundant number, since it is smaller than the sum of its proper divisors (2052440).

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

1305640 is a wasteful number, since it uses less digits than its factorization.

1305640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4681 (or 4677 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 1305640 is about 1142.6460519338. The cubic root of 1305640 is about 109.2968928066.

The spelling of 1305640 in words is "one million, three hundred five thousand, six hundred forty".