744427021 has 4 divisors (see below), whose sum is σ = 801690652. Its totient is φ = 687163392.

The previous prime is 744427009. The next prime is 744427091. The reversal of 744427021 is 120724447.

744427021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 469198921 + 275228100 = 21661^2 + 16590^2 .

It is a cyclic number.

It is not a de Polignac number, because 744427021 - 2⁵ = 744426989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (744427091) 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, 28631796 + ... + 28631821.

It is an arithmetic number, because the mean of its divisors is an integer number (200422663).

Almost surely, 2^744427021 is an apocalyptic number.

It is an amenable number.

744427021 is a deficient number, since it is larger than the sum of its proper divisors (57263631).

744427021 is a wasteful number, since it uses less digits than its factorization.

744427021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57263630.

The product of its (nonzero) digits is 12544, while the sum is 31.

The square root of 744427021 is about 27284.1899458276. The cubic root of 744427021 is about 906.3043049123.

The spelling of 744427021 in words is "seven hundred forty-four million, four hundred twenty-seven thousand, twenty-one".