7897638 has 32 divisors (see below), whose sum is σ = 18475776. Its totient is φ = 2203488.

The previous prime is 7897633. The next prime is 7897649. The reversal of 7897638 is 8367987.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7897633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 381 + ... + 3992.

It is an arithmetic number, because the mean of its divisors is an integer number (577368).

Almost surely, 2^7897638 is an apocalyptic number.

7897638 is an abundant number, since it is smaller than the sum of its proper divisors (10578138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7897638 is a wasteful number, since it uses less digits than its factorization.

7897638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4428.

The product of its digits is 508032, while the sum is 48.

The square root of 7897638 is about 2810.2736521556. The cubic root of 7897638 is about 199.1433190615.

The spelling of 7897638 in words is "seven million, eight hundred ninety-seven thousand, six hundred thirty-eight".