2557406 has 8 divisors (see below), whose sum is σ = 3843504. Its totient is φ = 1276240.

The previous prime is 2557397. The next prime is 2557417. The reversal of 2557406 is 6047552.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 626 + ... + 2346.

It is an arithmetic number, because the mean of its divisors is an integer number (480438).

2^2557406 is an apocalyptic number.

2557406 is a deficient number, since it is larger than the sum of its proper divisors (1286098).

2557406 is a wasteful number, since it uses less digits than its factorization.

2557406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2466.

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 2557406 is about 1599.1891695481. The cubic root of 2557406 is about 136.7518551441.

The spelling of 2557406 in words is "two million, five hundred fifty-seven thousand, four hundred six".