7928381 has 4 divisors (see below), whose sum is σ = 7938432. Its totient is φ = 7918332.

The previous prime is 7928369. The next prime is 7928407. The reversal of 7928381 is 1838297.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7928381 - 2⁶ = 7928317 is a prime.

It is a super-2 number, since 2×7928381² = 125718450562322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7928351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3731 + ... + 5456.

It is an arithmetic number, because the mean of its divisors is an integer number (1984608).

Almost surely, 2^7928381 is an apocalyptic number.

It is an amenable number.

7928381 is a deficient number, since it is larger than the sum of its proper divisors (10051).

7928381 is an equidigital number, since it uses as much as digits as its factorization.

7928381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10050.

The product of its digits is 24192, while the sum is 38.

The square root of 7928381 is about 2815.7380915135. The cubic root of 7928381 is about 199.4013850885.

The spelling of 7928381 in words is "seven million, nine hundred twenty-eight thousand, three hundred eighty-one".