26399142 has 96 divisors (see below), whose sum is σ = 74528640. Its totient is φ = 6849360.

The previous prime is 26399129. The next prime is 26399159. The reversal of 26399142 is 24199362.

26399142 is a `hidden beast` number, since 2 + 639 + 9 + 14 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 26399097 and 26399106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28653 + ... + 29559.

It is an arithmetic number, because the mean of its divisors is an integer number (776340).

Almost surely, 2^26399142 is an apocalyptic number.

26399142 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 26399142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37264320).

26399142 is an abundant number, since it is smaller than the sum of its proper divisors (48129498).

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

26399142 is a wasteful number, since it uses less digits than its factorization.

26399142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943 (or 930 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 26399142 is about 5138.0095367759. The cubic root of 26399142 is about 297.7578848105.

It can be divided in two parts, 2639 and 9142, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 26399142 in words is "twenty-six million, three hundred ninety-nine thousand, one hundred forty-two".