1591920 has 160 divisors (see below), whose sum is σ = 6071040. Its totient is φ = 380160.

The previous prime is 1591913. The next prime is 1591921. The reversal of 1591920 is 291951.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1591921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23727 + ... + 23793.

It is an arithmetic number, because the mean of its divisors is an integer number (37944).

2^1591920 is an apocalyptic number.

1591920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1591920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3035520).

1591920 is an abundant number, since it is smaller than the sum of its proper divisors (4479120).

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

1591920 is a wasteful number, since it uses less digits than its factorization.

1591920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 27.

The square root of 1591920 is about 1261.7131211175. The cubic root of 1591920 is about 116.7634933133.

The spelling of 1591920 in words is "one million, five hundred ninety-one thousand, nine hundred twenty".