1581960 has 32 divisors (see below), whose sum is σ = 4746240. Its totient is φ = 421824.

The previous prime is 1581949. The next prime is 1582001. The reversal of 1581960 is 691851.

It is a happy number.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 6472 + ... + 6711.

It is an arithmetic number, because the mean of its divisors is an integer number (148320).

2^1581960 is an apocalyptic number.

1581960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1581960 is an abundant number, since it is smaller than the sum of its proper divisors (3164280).

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

1581960 is a wasteful number, since it uses less digits than its factorization.

1581960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13197 (or 13193 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 1581960 is about 1257.7599134970. The cubic root of 1581960 is about 116.5194696902.

The spelling of 1581960 in words is "one million, five hundred eighty-one thousand, nine hundred sixty".