1581340 has 24 divisors (see below), whose sum is σ = 3516912. Its totient is φ = 595200.

The previous prime is 1581317. The next prime is 1581367. The reversal of 1581340 is 431851.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1986 + ... + 2665.

It is an arithmetic number, because the mean of its divisors is an integer number (146538).

2^1581340 is an apocalyptic number.

1581340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1581340 is an abundant number, since it is smaller than the sum of its proper divisors (1935572).

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

1581340 is a wasteful number, since it uses less digits than its factorization.

1581340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4677 (or 4675 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1581340 is about 1257.5134194115. The cubic root of 1581340 is about 116.5042456409.

The spelling of 1581340 in words is "one million, five hundred eighty-one thousand, three hundred forty".