727121749 has 4 divisors (see below), whose sum is σ = 735882336. Its totient is φ = 718361164.

The previous prime is 727121741. The next prime is 727121753. The reversal of 727121749 is 947121727.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 947121727 = 28087 ⋅33721.

It is a cyclic number.

It is not a de Polignac number, because 727121749 - 2³ = 727121741 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (727121741) 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, 4380169 + ... + 4380334.

It is an arithmetic number, because the mean of its divisors is an integer number (183970584).

Almost surely, 2^727121749 is an apocalyptic number.

It is an amenable number.

727121749 is a deficient number, since it is larger than the sum of its proper divisors (8760587).

727121749 is an equidigital number, since it uses as much as digits as its factorization.

727121749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8760586.

The product of its digits is 49392, while the sum is 40.

The square root of 727121749 is about 26965.1951411444. The cubic root of 727121749 is about 899.2263924270.

The spelling of 727121749 in words is "seven hundred twenty-seven million, one hundred twenty-one thousand, seven hundred forty-nine".