26405730 has 64 divisors (see below), whose sum is σ = 75841920. Its totient is φ = 6499008.

The previous prime is 26405723. The next prime is 26405767. The reversal of 26405730 is 3750462.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 26405694 and 26405703.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 252 + ... + 7271.

It is an arithmetic number, because the mean of its divisors is an integer number (1185030).

Almost surely, 2^26405730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26405730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37920960).

26405730 is an abundant number, since it is smaller than the sum of its proper divisors (49436190).

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

26405730 is a wasteful number, since it uses less digits than its factorization.

26405730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7552 (or 7546 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 26405730 is about 5138.6506010820. The cubic root of 26405730 is about 297.7826515976.

The spelling of 26405730 in words is "twenty-six million, four hundred five thousand, seven hundred thirty".