1087920 has 60 divisors (see below), whose sum is σ = 3656016. Its totient is φ = 289920.

The previous prime is 1087907. The next prime is 1087937. The reversal of 1087920 is 297801.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36 + ... + 1475.

2^1087920 is an apocalyptic number.

1087920 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 1087920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1828008).

1087920 is an abundant number, since it is smaller than the sum of its proper divisors (2568096).

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

1087920 is a wasteful number, since it uses less digits than its factorization.

1087920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530 (or 1521 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 1087920 is about 1043.0340358780. The cubic root of 1087920 is about 102.8487427002.

The spelling of 1087920 in words is "one million, eighty-seven thousand, nine hundred twenty".