1440652021 has 2 divisors, whose sum is σ = 1440652022. Its totient is φ = 1440652020.

The previous prime is 1440652001. The next prime is 1440652033. The reversal of 1440652021 is 1202560441.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1153349521 + 287302500 = 33961^2 + 16950^2 .

It is a cyclic number.

It is not a de Polignac number, because 1440652021 - 2¹³ = 1440643829 is a prime.

It is a super-2 number, since 2×1440652021² = 4150956491222768882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1440652001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 720326010 + 720326011.

It is an arithmetic number, because the mean of its divisors is an integer number (720326011).

Almost surely, 2^1440652021 is an apocalyptic number.

It is an amenable number.

1440652021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1440652021 is an equidigital number, since it uses as much as digits as its factorization.

1440652021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1440652021 is about 37955.9220807505. The cubic root of 1440652021 is about 1129.4136465096.

The spelling of 1440652021 in words is "one billion, four hundred forty million, six hundred fifty-two thousand, twenty-one".