8240638 has 16 divisors (see below), whose sum is σ = 14254560. Its totient is φ = 3499776.

The previous prime is 8240633. The next prime is 8240663. The reversal of 8240638 is 8360428.

It is a happy number.

It is a super-2 number, since 2×8240638² = 135816229294088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8240633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1023 + ... + 4186.

It is an arithmetic number, because the mean of its divisors is an integer number (890910).

Almost surely, 2^8240638 is an apocalyptic number.

8240638 is a deficient number, since it is larger than the sum of its proper divisors (6013922).

8240638 is a wasteful number, since it uses less digits than its factorization.

8240638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5331.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 8240638 is about 2870.6511456462. The cubic root of 8240638 is about 201.9855395981.

The spelling of 8240638 in words is "eight million, two hundred forty thousand, six hundred thirty-eight".