1391408 has 40 divisors (see below), whose sum is σ = 2976000. Its totient is φ = 627264.

The previous prime is 1391407. The next prime is 1391413. The reversal of 1391408 is 8041931.

It is not an unprimeable number, because it can be changed into a prime (1391407) 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, 6893 + ... + 7091.

It is an arithmetic number, because the mean of its divisors is an integer number (74400).

2^1391408 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 1391408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1488000).

1391408 is an abundant number, since it is smaller than the sum of its proper divisors (1584592).

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

1391408 is a wasteful number, since it uses less digits than its factorization.

1391408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1391408 is about 1179.5795861238. The cubic root of 1391408 is about 111.6395726450.

The spelling of 1391408 in words is "one million, three hundred ninety-one thousand, four hundred eight".