427720939 has 4 divisors (see below), whose sum is σ = 430553680. Its totient is φ = 424888200.

The previous prime is 427720921. The next prime is 427720967. The reversal of 427720939 is 939027724.

It is a happy number.

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 427720939 - 2⁹ = 427720427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 427720895 and 427720904.

It is not an unprimeable number, because it can be changed into a prime (427724939) 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, 1416144 + ... + 1416445.

It is an arithmetic number, because the mean of its divisors is an integer number (107638420).

Almost surely, 2^427720939 is an apocalyptic number.

427720939 is a deficient number, since it is larger than the sum of its proper divisors (2832741).

427720939 is a wasteful number, since it uses less digits than its factorization.

427720939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2832740.

The product of its (nonzero) digits is 190512, while the sum is 43.

The square root of 427720939 is about 20681.4153045675. The cubic root of 427720939 is about 753.4483807421.

The spelling of 427720939 in words is "four hundred twenty-seven million, seven hundred twenty thousand, nine hundred thirty-nine".