744921 has 12 divisors (see below), whose sum is σ = 1105572. Its totient is φ = 482976.

The previous prime is 744917. The next prime is 744941. The reversal of 744921 is 129447.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 632025 + 112896 = 795^2 + 336^2 .

It is not a de Polignac number, because 744921 - 2² = 744917 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a d-powerful number, because it can be written as 7⁵ + 4³ + 9⁶ + 4⁸ + 2¹⁷ + 1 .

744921 is a lucky number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (744911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 786 + ... + 1451.

It is an arithmetic number, because the mean of its divisors is an integer number (92131).

2⁷⁴⁴⁹²¹ is an apocalyptic number.

It is an amenable number.

744921 is a deficient number, since it is larger than the sum of its proper divisors (360651).

744921 is a wasteful number, since it uses less digits than its factorization.

744921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280 (or 2277 counting only the distinct ones).

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

The square root of 744921 is about 863.0880603971. The cubic root of 744921 is about 90.6504725859.

The spelling of 744921 in words is "seven hundred forty-four thousand, nine hundred twenty-one".