1401408 has 56 divisors (see below), whose sum is σ = 4124960. Its totient is φ = 466560.

The previous prime is 1401403. The next prime is 1401409. The reversal of 1401408 is 8041041.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1401401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1323 + ... + 2133.

It is an arithmetic number, because the mean of its divisors is an integer number (73660).

2^1401408 is an apocalyptic number.

1401408 is a gapful number since it is divisible by the number (18) 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 1401408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2062480).

1401408 is an abundant number, since it is smaller than the sum of its proper divisors (2723552).

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

1401408 is an equidigital number, since it uses as much as digits as its factorization.

1401408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832 (or 816 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1401408 is about 1183.8107956933. The cubic root of 1401408 is about 111.9063843578.

Adding to 1401408 its reverse (8041041), we get a palindrome (9442449).

The spelling of 1401408 in words is "one million, four hundred one thousand, four hundred eight".