27649399 has 2 divisors, whose sum is σ = 27649400. Its totient is φ = 27649398.

The previous prime is 27649393. The next prime is 27649421. The reversal of 27649399 is 99394672.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27649399 - 2⁵ = 27649367 is a prime.

It is a super-2 number, since 2×27649399² = 1528978530122402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27649393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13824699 + 13824700.

It is an arithmetic number, because the mean of its divisors is an integer number (13824700).

Almost surely, 2^27649399 is an apocalyptic number.

27649399 is a deficient number, since it is larger than the sum of its proper divisors (1).

27649399 is an equidigital number, since it uses as much as digits as its factorization.

27649399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 49.

The square root of 27649399 is about 5258.2695822866. The cubic root of 27649399 is about 302.3861520900.

The spelling of 27649399 in words is "twenty-seven million, six hundred forty-nine thousand, three hundred ninety-nine".