413821 has 4 divisors (see below), whose sum is σ = 415872. Its totient is φ = 411772.

The previous prime is 413807. The next prime is 413827. The reversal of 413821 is 128314.

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, and also an emirpimes, since its reverse is a distinct semiprime: 128314 = 2 ⋅64157.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-413821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (413827) 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, 685 + ... + 1138.

It is an arithmetic number, because the mean of its divisors is an integer number (103968).

2⁴¹³⁸²¹ is an apocalyptic number.

It is an amenable number.

413821 is a deficient number, since it is larger than the sum of its proper divisors (2051).

413821 is a wasteful number, since it uses less digits than its factorization.

413821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050.

The product of its digits is 192, while the sum is 19.

The square root of 413821 is about 643.2892040132. The cubic root of 413821 is about 74.5196560900.

The spelling of 413821 in words is "four hundred thirteen thousand, eight hundred twenty-one".