1439975221 has 2 divisors, whose sum is σ = 1439975222. Its totient is φ = 1439975220.

The previous prime is 1439975219. The next prime is 1439975231. The reversal of 1439975221 is 1225799341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1436031025 + 3944196 = 37895^2 + 1986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1439975221 - 2¹ = 1439975219 is a prime.

Together with 1439975219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1439975231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719987610 + 719987611.

It is an arithmetic number, because the mean of its divisors is an integer number (719987611).

Almost surely, 2^1439975221 is an apocalyptic number.

It is an amenable number.

1439975221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1439975221 is an equidigital number, since it uses as much as digits as its factorization.

1439975221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The square root of 1439975221 is about 37947.0054286237. The cubic root of 1439975221 is about 1129.2367574168.

The spelling of 1439975221 in words is "one billion, four hundred thirty-nine million, nine hundred seventy-five thousand, two hundred twenty-one".