421399 has 8 divisors (see below), whose sum is σ = 475920. Its totient is φ = 369600.

The previous prime is 421397. The next prime is 421409. The reversal of 421399 is 993124.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 421399 - 2¹ = 421397 is a prime.

It is a Duffinian number.

421399 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342 + ... + 979.

It is an arithmetic number, because the mean of its divisors is an integer number (59490).

2⁴²¹³⁹⁹ is an apocalyptic number.

421399 is a deficient number, since it is larger than the sum of its proper divisors (54521).

421399 is a wasteful number, since it uses less digits than its factorization.

421399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361.

The product of its digits is 1944, while the sum is 28.

The square root of 421399 is about 649.1525244501. The cubic root of 421399 is about 74.9717819772.

It can be divided in two parts, 421 and 399, that added together give a triangular number (820 = T₄₀).

The spelling of 421399 in words is "four hundred twenty-one thousand, three hundred ninety-nine".