421929 has 10 divisors (see below), whose sum is σ = 630410. Its totient is φ = 281232.

The previous prime is 421913. The next prime is 421943. The reversal of 421929 is 929124.

It can be written as a sum of positive squares in only one way, i.e., 419904 + 2025 = 648^2 + 45^2 .

It is not a de Polignac number, because 421929 - 2⁴ = 421913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420929) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2524 + ... + 2685.

It is an arithmetic number, because the mean of its divisors is an integer number (63041).

2⁴²¹⁹²⁹ is an apocalyptic number.

It is an amenable number.

421929 is a deficient number, since it is larger than the sum of its proper divisors (208481).

421929 is an equidigital number, since it uses as much as digits as its factorization.

421929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5221 (or 5212 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 421929 is about 649.5606207276. The cubic root of 421929 is about 75.0031998635.

It can be divided in two parts, 42 and 1929, that multiplied together give a palindrome (81018).

The spelling of 421929 in words is "four hundred twenty-one thousand, nine hundred twenty-nine".