5397991 has 4 divisors (see below), whose sum is σ = 5466400. Its totient is φ = 5329584.

The previous prime is 5397979. The next prime is 5398037. The reversal of 5397991 is 1997935.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1997935 = 5 ⋅399587.

It is a cyclic number.

It is not a de Polignac number, because 5397991 - 2⁷ = 5397863 is a prime.

It is a Duffinian number.

5397991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5397961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34086 + ... + 34243.

It is an arithmetic number, because the mean of its divisors is an integer number (1366600).

Almost surely, 2^5397991 is an apocalyptic number.

5397991 is a deficient number, since it is larger than the sum of its proper divisors (68409).

5397991 is an equidigital number, since it uses as much as digits as its factorization.

5397991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68408.

The product of its digits is 76545, while the sum is 43.

The square root of 5397991 is about 2323.3576995375. The cubic root of 5397991 is about 175.4193047362.

The spelling of 5397991 in words is "five million, three hundred ninety-seven thousand, nine hundred ninety-one".