8040400 has 30 divisors (see below), whose sum is σ = 19318022. Its totient is φ = 3216000.

The previous prime is 8040391. The next prime is 8040407. The reversal of 8040400 is 40408.

It can be written as a sum of positive squares in 3 ways, for example, as 222784 + 7817616 = 472^2 + 2796^2 .

It is a super-3 number, since 3×8040400³ (a number of 22 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8040407) 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, 9651 + ... + 10450.

Almost surely, 2^8040400 is an apocalyptic number.

8040400 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8040400 is an abundant number, since it is smaller than the sum of its proper divisors (11277622).

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

8040400 is a wasteful number, since it uses less digits than its factorization.

8040400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20119 (or 20108 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 8040400 is about 2835.5599094359. The cubic root of 8040400 is about 200.3361015291.

Adding to 8040400 its reverse (40408), we get a palindrome (8080808).

The spelling of 8040400 in words is "eight million, forty thousand, four hundred".