1538406 has 32 divisors (see below), whose sum is σ = 3532800. Its totient is φ = 495720.

The previous prime is 1538399. The next prime is 1538413. The reversal of 1538406 is 6048351.

It is an interprime number because it is at equal distance from previous prime (1538399) and next prime (1538413).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 1538406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1215 + ... + 2133.

It is an arithmetic number, because the mean of its divisors is an integer number (110400).

2^1538406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1538406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1766400).

1538406 is an abundant number, since it is smaller than the sum of its proper divisors (1994394).

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

1538406 is a wasteful number, since it uses less digits than its factorization.

1538406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961 (or 955 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1538406 is about 1240.3249574204. The cubic root of 1538406 is about 115.4401781629.

The spelling of 1538406 in words is "one million, five hundred thirty-eight thousand, four hundred six".