2647391 has 2 divisors, whose sum is σ = 2647392.
Its totient is φ = 2647390.
The previous prime is 2647373. The next prime is 2647397. The reversal of 2647391 is 1937462.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 2647391 - 214 = 2631007 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (2647397) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1323695 + 1323696.
It is an arithmetic number, because the mean of its divisors is an integer number (1323696).
22647391 is an apocalyptic number.
2647391 is a deficient number, since it is larger than the sum of its proper divisors (1).
2647391 is an equidigital number, since it uses as much as digits as its factorization.
2647391 is an evil number, because the sum of its binary digits is even.
The product of its digits is 9072, while the sum is 32.
The square root of 2647391 is about 1627.0805142955.
The cubic root of 2647391 is about 138.3373215411.
The spelling of 2647391 in words is "two million, six hundred forty-seven thousand, three hundred ninety-one".