8139400 has 24 divisors (see below), whose sum is σ = 18924570. Its totient is φ = 3255680.

The previous prime is 8139377. The next prime is 8139403. The reversal of 8139400 is 49318.

It can be written as a sum of positive squares in 3 ways, for example, as 3290596 + 4848804 = 1814^2 + 2202^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (8139403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20149 + ... + 20548.

Almost surely, 2^8139400 is an apocalyptic number.

It is an amenable number.

8139400 is an abundant number, since it is smaller than the sum of its proper divisors (10785170).

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

8139400 is a wasteful number, since it uses less digits than its factorization.

8139400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40713 (or 40704 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 8139400 is about 2852.9633716541. The cubic root of 8139400 is about 201.1549838883.

The spelling of 8139400 in words is "eight million, one hundred thirty-nine thousand, four hundred".