26979840 has 120 divisors (see below), whose sum is σ = 93518568. Its totient is φ = 7188480.

The previous prime is 26979839. The next prime is 26979847. The reversal of 26979840 is 4897962.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26979847) 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 11 ways as a sum of consecutive naturals, for example, 22455 + ... + 23625.

Almost surely, 2^26979840 is an apocalyptic number.

26979840 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 26979840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46759284).

26979840 is an abundant number, since it is smaller than the sum of its proper divisors (66538728).

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

26979840 is a wasteful number, since it uses less digits than its factorization.

26979840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1200 (or 1181 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 26979840 is about 5194.2121635528. The cubic root of 26979840 is about 299.9253147419.

The spelling of 26979840 in words is "twenty-six million, nine hundred seventy-nine thousand, eight hundred forty".