1420423921 has 4 divisors (see below), whose sum is σ = 1623341632. Its totient is φ = 1217506212.

The previous prime is 1420423913. The next prime is 1420423951. The reversal of 1420423921 is 1293240241.

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.

It is a cyclic number.

It is not a de Polignac number, because 1420423921 - 2³ = 1420423913 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 1420423921.

It is not an unprimeable number, because it can be changed into a prime (1420423951) 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 3 ways as a sum of consecutive naturals, for example, 101458845 + ... + 101458858.

It is an arithmetic number, because the mean of its divisors is an integer number (405835408).

Almost surely, 2^1420423921 is an apocalyptic number.

It is an amenable number.

1420423921 is a deficient number, since it is larger than the sum of its proper divisors (202917711).

1420423921 is an equidigital number, since it uses as much as digits as its factorization.

1420423921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202917710.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1420423921 is about 37688.5117907301. The cubic root of 1420423921 is about 1124.1027040329.

The spelling of 1420423921 in words is "one billion, four hundred twenty million, four hundred twenty-three thousand, nine hundred twenty-one".