727421 has 4 divisors (see below), whose sum is σ = 759072. Its totient is φ = 695772.

The previous prime is 727409. The next prime is 727427. The reversal of 727421 is 124727.

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: 124727 = 37 ⋅3371.

It is a cyclic number.

It is not a de Polignac number, because 727421 - 2¹⁸ = 465277 is a prime.

It is a super-2 number, since 2×727421² = 1058282622482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 31627 = 727421 / (7 + 2 + 7 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (727427) 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, 15791 + ... + 15836.

It is an arithmetic number, because the mean of its divisors is an integer number (189768).

2⁷²⁷⁴²¹ is an apocalyptic number.

It is an amenable number.

727421 is a deficient number, since it is larger than the sum of its proper divisors (31651).

727421 is a wasteful number, since it uses less digits than its factorization.

727421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31650.

The product of its digits is 784, while the sum is 23.

The square root of 727421 is about 852.8897935841. The cubic root of 727421 is about 89.9349736049.

The spelling of 727421 in words is "seven hundred twenty-seven thousand, four hundred twenty-one", and thus it is an iban number.