1523406 has 8 divisors (see below), whose sum is σ = 3046824. Its totient is φ = 507800.

The previous prime is 1523393. The next prime is 1523407. The reversal of 1523406 is 6043251.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

1523406 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1523407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126945 + ... + 126956.

It is an arithmetic number, because the mean of its divisors is an integer number (380853).

2^1523406 is an apocalyptic number.

1523406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1523406 is a wasteful number, since it uses less digits than its factorization.

1523406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253906.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1523406 is about 1234.2633430512. The cubic root of 1523406 is about 115.0637579657.

Subtracting from 1523406 its sum of digits (21), we obtain a triangular number (1523385 = T₁₇₄₅).

Adding to 1523406 its reverse (6043251), we get a palindrome (7566657).

The spelling of 1523406 in words is "one million, five hundred twenty-three thousand, four hundred six".