1581396 has 12 divisors (see below), whose sum is σ = 3689952. Its totient is φ = 527128.

The previous prime is 1581379. The next prime is 1581413. The reversal of 1581396 is 6931851.

It is an interprime number because it is at equal distance from previous prime (1581379) and next prime (1581413).

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 65880 + ... + 65903.

It is an arithmetic number, because the mean of its divisors is an integer number (307496).

2^1581396 is an apocalyptic number.

It is an amenable number.

1581396 is an abundant number, since it is smaller than the sum of its proper divisors (2108556).

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

1581396 is a wasteful number, since it uses less digits than its factorization.

1581396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131790 (or 131788 counting only the distinct ones).

The product of its digits is 6480, while the sum is 33.

The square root of 1581396 is about 1257.5356853784. The cubic root of 1581396 is about 116.5056208798.

The spelling of 1581396 in words is "one million, five hundred eighty-one thousand, three hundred ninety-six".