1407444021 has 6 divisors (see below), whose sum is σ = 2032974710. Its totient is φ = 938296008.

The previous prime is 1407444007. The next prime is 1407444139. The reversal of 1407444021 is 1204447041.

It can be written as a sum of positive squares in only one way, i.e., 906311025 + 501132996 = 30105^2 + 22386^2 .

It is not a de Polignac number, because 1407444021 - 2⁷ = 1407443893 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 (1407444821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 78191326 + ... + 78191343.

Almost surely, 2^1407444021 is an apocalyptic number.

It is an amenable number.

1407444021 is a deficient number, since it is larger than the sum of its proper divisors (625530689).

1407444021 is a wasteful number, since it uses less digits than its factorization.

1407444021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156382675 (or 156382672 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 1407444021 is about 37515.9169020297. The cubic root of 1407444021 is about 1120.6681867959.

The spelling of 1407444021 in words is "one billion, four hundred seven million, four hundred forty-four thousand, twenty-one".