2638406 has 8 divisors (see below), whose sum is σ = 3994920. Its totient is φ = 1306768.

The previous prime is 2638403. The next prime is 2638411. The reversal of 2638406 is 6048362.

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

It is a super-2 number, since 2×2638406² = 13922372441672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2638403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5951 + ... + 6378.

It is an arithmetic number, because the mean of its divisors is an integer number (499365).

2^2638406 is an apocalyptic number.

2638406 is a deficient number, since it is larger than the sum of its proper divisors (1356514).

2638406 is a wasteful number, since it uses less digits than its factorization.

2638406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12438.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 2638406 is about 1624.3170872708. The cubic root of 2638406 is about 138.1806428014.

The spelling of 2638406 in words is "two million, six hundred thirty-eight thousand, four hundred six".