421947 has 12 divisors (see below), whose sum is σ = 615264. Its totient is φ = 278640.

The previous prime is 421943. The next prime is 421973. The reversal of 421947 is 749124.

It is a happy number.

It is not a de Polignac number, because 421947 - 2² = 421943 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 421947.

It is not an unprimeable number, because it can be changed into a prime (421943) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1422 + ... + 1692.

It is an arithmetic number, because the mean of its divisors is an integer number (51272).

2⁴²¹⁹⁴⁷ is an apocalyptic number.

421947 is a deficient number, since it is larger than the sum of its proper divisors (193317).

421947 is a wasteful number, since it uses less digits than its factorization.

421947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450 (or 447 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 421947 is about 649.5744760995. The cubic root of 421947 is about 75.0042664240.

The spelling of 421947 in words is "four hundred twenty-one thousand, nine hundred forty-seven".