749421 has 6 divisors (see below), whose sum is σ = 1082510. Its totient is φ = 499608.

The previous prime is 749401. The next prime is 749423. The reversal of 749421 is 124947.

It is a happy number.

749421 is nontrivially palindromic in base 2.

It can be written as a sum of positive squares in only one way, i.e., 741321 + 8100 = 861^2 + 90^2 .

It is not a de Polignac number, because 749421 - 2¹³ = 741229 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (749423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 41626 + ... + 41643.

2⁷⁴⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

749421 is a deficient number, since it is larger than the sum of its proper divisors (333089).

749421 is a wasteful number, since it uses less digits than its factorization.

749421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83275 (or 83272 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 749421 is about 865.6910534365. The cubic root of 749421 is about 90.8326433375.

The spelling of 749421 in words is "seven hundred forty-nine thousand, four hundred twenty-one".