2478638 has 4 divisors (see below), whose sum is σ = 3717960. Its totient is φ = 1239318.

The previous prime is 2478631. The next prime is 2478643. The reversal of 2478638 is 8368742.

2478638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×2478638² = 12287292670088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2478631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619658 + ... + 619661.

It is an arithmetic number, because the mean of its divisors is an integer number (929490).

2^2478638 is an apocalyptic number.

2478638 is a deficient number, since it is larger than the sum of its proper divisors (1239322).

2478638 is a wasteful number, since it uses less digits than its factorization.

2478638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239321.

The product of its digits is 64512, while the sum is 38.

The square root of 2478638 is about 1574.3690799809. The cubic root of 2478638 is about 135.3332052598. Note that the first 3 decimals are identical.

The spelling of 2478638 in words is "two million, four hundred seventy-eight thousand, six hundred thirty-eight".