26400040 has 16 divisors (see below), whose sum is σ = 59400180. Its totient is φ = 10560000.

The previous prime is 26400029. The next prime is 26400047. The reversal of 26400040 is 4000462.

It can be written as a sum of positive squares in 2 ways, for example, as 26193924 + 206116 = 5118^2 + 454^2 .

It is a super-2 number, since 2×26400040² = 1393924224003200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 26399987 and 26400023.

It is not an unprimeable number, because it can be changed into a prime (26400047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329961 + ... + 330040.

Almost surely, 2^26400040 is an apocalyptic number.

26400040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26400040 is an abundant number, since it is smaller than the sum of its proper divisors (33000140).

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

26400040 is a wasteful number, since it uses less digits than its factorization.

26400040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660012 (or 660008 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 26400040 is about 5138.0969239593. The cubic root of 26400040 is about 297.7612609751.

The spelling of 26400040 in words is "twenty-six million, four hundred thousand, forty".