1421928539 has 4 divisors (see below), whose sum is σ = 1422666840. Its totient is φ = 1421190240.

The previous prime is 1421928511. The next prime is 1421928581. The reversal of 1421928539 is 9358291241.

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

It is a cyclic number.

It is not a de Polignac number, because 1421928539 - 2²⁰ = 1420879963 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1421928539.

It is not an unprimeable number, because it can be changed into a prime (1421928509) 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, 366254 + ... + 370115.

It is an arithmetic number, because the mean of its divisors is an integer number (355666710).

Almost surely, 2^1421928539 is an apocalyptic number.

1421928539 is a deficient number, since it is larger than the sum of its proper divisors (738301).

1421928539 is an equidigital number, since it uses as much as digits as its factorization.

1421928539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738300.

The product of its digits is 155520, while the sum is 44.

The square root of 1421928539 is about 37708.4677360404. The cubic root of 1421928539 is about 1124.4994748582.

The spelling of 1421928539 in words is "one billion, four hundred twenty-one million, nine hundred twenty-eight thousand, five hundred thirty-nine".