26403840 has 176 divisors, whose sum is σ = 94325760. Its totient is φ = 7004160.

The previous prime is 26403827. The next prime is 26403841. The reversal of 26403840 is 4830462.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26403841) 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, 138145 + ... + 138335.

Almost surely, 2^26403840 is an apocalyptic number.

26403840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26403840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47162880).

26403840 is an abundant number, since it is smaller than the sum of its proper divisors (67921920).

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

26403840 is a wasteful number, since it uses less digits than its factorization.

26403840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 201 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 26403840 is about 5138.4666973719. The cubic root of 26403840 is about 297.7755467932.

The spelling of 26403840 in words is "twenty-six million, four hundred three thousand, eight hundred forty".