26391390 has 16 divisors (see below), whose sum is σ = 63339408. Its totient is φ = 7037696.

The previous prime is 26391383. The next prime is 26391433. The reversal of 26391390 is 9319362.

It is a super-2 number, since 2×26391390² = 1393010932264200, which contains 22 as substring.

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, 439827 + ... + 439886.

It is an arithmetic number, because the mean of its divisors is an integer number (3958713).

Almost surely, 2^26391390 is an apocalyptic number.

26391390 is an abundant number, since it is smaller than the sum of its proper divisors (36948018).

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

26391390 is a wasteful number, since it uses less digits than its factorization.

26391390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879723.

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 26391390 is about 5137.2551036521. The cubic root of 26391390 is about 297.7287368291.

The spelling of 26391390 in words is "twenty-six million, three hundred ninety-one thousand, three hundred ninety".