1439953653 has 4 divisors (see below), whose sum is σ = 1919938208. Its totient is φ = 959969100.

The previous prime is 1439953649. The next prime is 1439953673. The reversal of 1439953653 is 3563599341.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3563599341 = 3 ⋅1187866447.

It is not a de Polignac number, because 1439953653 - 2² = 1439953649 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 (1439953643) 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, 239992273 + ... + 239992278.

It is an arithmetic number, because the mean of its divisors is an integer number (479984552).

Almost surely, 2^1439953653 is an apocalyptic number.

It is an amenable number.

1439953653 is a deficient number, since it is larger than the sum of its proper divisors (479984555).

1439953653 is an equidigital number, since it uses as much as digits as its factorization.

1439953653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479984554.

The product of its digits is 1312200, while the sum is 48.

The square root of 1439953653 is about 37946.7212417621. The cubic root of 1439953653 is about 1129.2311194726.

The spelling of 1439953653 in words is "one billion, four hundred thirty-nine million, nine hundred fifty-three thousand, six hundred fifty-three".