26401491 has 16 divisors (see below), whose sum is σ = 40376320. Its totient is φ = 17032680.

The previous prime is 26401481. The next prime is 26401511. The reversal of 26401491 is 19410462.

26401491 is a `hidden beast` number, since 2 + 640 + 14 + 9 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-26401491 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26401411) 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, 14935 + ... + 16608.

It is an arithmetic number, because the mean of its divisors is an integer number (2523520).

Almost surely, 2^26401491 is an apocalyptic number.

26401491 is a deficient number, since it is larger than the sum of its proper divisors (13974829).

26401491 is a wasteful number, since it uses less digits than its factorization.

26401491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31583 (or 31577 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 26401491 is about 5138.2381221582. The cubic root of 26401491 is about 297.7667160637.

The spelling of 26401491 in words is "twenty-six million, four hundred one thousand, four hundred ninety-one".