26398140 has 24 divisors (see below), whose sum is σ = 73914960. Its totient is φ = 7039488.

The previous prime is 26398129. The next prime is 26398153. The reversal of 26398140 is 4189362.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219925 + ... + 220044.

It is an arithmetic number, because the mean of its divisors is an integer number (3079790).

Almost surely, 2^26398140 is an apocalyptic number.

26398140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26398140 is an abundant number, since it is smaller than the sum of its proper divisors (47516820).

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

26398140 is a wasteful number, since it uses less digits than its factorization.

26398140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439981 (or 439979 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 26398140 is about 5137.9120272733. The cubic root of 26398140 is about 297.7541175520.

The spelling of 26398140 in words is "twenty-six million, three hundred ninety-eight thousand, one hundred forty".