1391928 has 32 divisors (see below), whose sum is σ = 3542400. Its totient is φ = 455648.

The previous prime is 1391927. The next prime is 1391933. The reversal of 1391928 is 8291931.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 925 + ... + 1907.

It is an arithmetic number, because the mean of its divisors is an integer number (110700).

2^1391928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1391928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1771200).

1391928 is an abundant number, since it is smaller than the sum of its proper divisors (2150472).

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

1391928 is a wasteful number, since it uses less digits than its factorization.

1391928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051 (or 1047 counting only the distinct ones).

The product of its digits is 3888, while the sum is 33.

The square root of 1391928 is about 1179.7999830480. The cubic root of 1391928 is about 111.6534783068.

The spelling of 1391928 in words is "one million, three hundred ninety-one thousand, nine hundred twenty-eight".