27691403 has 2 divisors, whose sum is σ = 27691404. Its totient is φ = 27691402.

The previous prime is 27691397. The next prime is 27691427. The reversal of 27691403 is 30419672.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27691403 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27691403.

It is not a weakly prime, because it can be changed into another prime (27691483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13845701 + 13845702.

It is an arithmetic number, because the mean of its divisors is an integer number (13845702).

Almost surely, 2^27691403 is an apocalyptic number.

27691403 is a deficient number, since it is larger than the sum of its proper divisors (1).

27691403 is an equidigital number, since it uses as much as digits as its factorization.

27691403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 27691403 is about 5262.2621561454. The cubic root of 27691403 is about 302.5391994371.

The spelling of 27691403 in words is "twenty-seven million, six hundred ninety-one thousand, four hundred three".