1521408 has 72 divisors (see below), whose sum is σ = 4643968. Its totient is φ = 433152.

The previous prime is 1521397. The next prime is 1521479. The reversal of 1521408 is 8041251.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5235 + ... + 5517.

2^1521408 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 1521408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2321984).

1521408 is an abundant number, since it is smaller than the sum of its proper divisors (3122560).

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

1521408 is an equidigital number, since it uses as much as digits as its factorization.

1521408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 1521408 is about 1233.4536878213. The cubic root of 1521408 is about 115.0134325834.

Adding to 1521408 its reverse (8041251), we get a palindrome (9562659).

The spelling of 1521408 in words is "one million, five hundred twenty-one thousand, four hundred eight".