1521906 has 8 divisors (see below), whose sum is σ = 3043824. Its totient is φ = 507300.

The previous prime is 1521901. The next prime is 1521913. The reversal of 1521906 is 6091251.

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

1521906 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (1521901) 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, 126820 + ... + 126831.

It is an arithmetic number, because the mean of its divisors is an integer number (380478).

2^1521906 is an apocalyptic number.

1521906 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.

1521906 is a wasteful number, since it uses less digits than its factorization.

1521906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253656.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 1521906 is about 1233.6555434966. The cubic root of 1521906 is about 115.0259802676.

The spelling of 1521906 in words is "one million, five hundred twenty-one thousand, nine hundred six".