7878381 has 16 divisors (see below), whose sum is σ = 12096000. Its totient is φ = 4467888.

The previous prime is 7878359. The next prime is 7878383. The reversal of 7878381 is 1838787.

It is not a de Polignac number, because 7878381 - 2⁶ = 7878317 is a prime.

It is a super-2 number, since 2×7878381² = 124137774362322, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7878383) 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, 1570 + ... + 4268.

It is an arithmetic number, because the mean of its divisors is an integer number (756000).

Almost surely, 2^7878381 is an apocalyptic number.

It is an amenable number.

7878381 is a deficient number, since it is larger than the sum of its proper divisors (4217619).

7878381 is a wasteful number, since it uses less digits than its factorization.

7878381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2848.

The product of its digits is 75264, while the sum is 42.

The square root of 7878381 is about 2806.8453822753. The cubic root of 7878381 is about 198.9813286860.

The spelling of 7878381 in words is "seven million, eight hundred seventy-eight thousand, three hundred eighty-one".