1391920 has 40 divisors (see below), whose sum is σ = 3285504. Its totient is φ = 548352.

The previous prime is 1391917. The next prime is 1391927. The reversal of 1391920 is 291931.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1391927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10092 + ... + 10228.

2^1391920 is an apocalyptic number.

1391920 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 1391920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1642752).

1391920 is an abundant number, since it is smaller than the sum of its proper divisors (1893584).

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

1391920 is a wasteful number, since it uses less digits than its factorization.

1391920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277 (or 271 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 1391920 is about 1179.7965926379. The cubic root of 1391920 is about 111.6532643998.

The spelling of 1391920 in words is "one million, three hundred ninety-one thousand, nine hundred twenty".