747738391 has 2 divisors, whose sum is σ = 747738392. Its totient is φ = 747738390.

The previous prime is 747738389. The next prime is 747738419. The reversal of 747738391 is 193837747.

It is a weak prime.

It is an emirp because it is prime and its reverse (193837747) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 747738391 - 2¹ = 747738389 is a prime.

It is a super-2 number, since 2×747738391² = 1118225402750537762, which contains 22 as substring.

Together with 747738389, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (747738991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 373869195 + 373869196.

It is an arithmetic number, because the mean of its divisors is an integer number (373869196).

Almost surely, 2^747738391 is an apocalyptic number.

747738391 is a deficient number, since it is larger than the sum of its proper divisors (1).

747738391 is an equidigital number, since it uses as much as digits as its factorization.

747738391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 889056, while the sum is 49.

The square root of 747738391 is about 27344.8055579117. The cubic root of 747738391 is about 907.6461288514.

The spelling of 747738391 in words is "seven hundred forty-seven million, seven hundred thirty-eight thousand, three hundred ninety-one".