936421 has 4 divisors (see below), whose sum is σ = 939744. Its totient is φ = 933100.

The previous prime is 936413. The next prime is 936437. The reversal of 936421 is 124639.

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: 124639 = 113 ⋅1103.

It is a cyclic number.

It is not a de Polignac number, because 936421 - 2³ = 936413 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 (936401) 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 3 ways as a sum of consecutive naturals, for example, 1195 + ... + 1816.

It is an arithmetic number, because the mean of its divisors is an integer number (234936).

2⁹³⁶⁴²¹ is an apocalyptic number.

It is an amenable number.

936421 is a deficient number, since it is larger than the sum of its proper divisors (3323).

936421 is a wasteful number, since it uses less digits than its factorization.

936421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3322.

The product of its digits is 1296, while the sum is 25.

The square root of 936421 is about 967.6884829324. The cubic root of 936421 is about 97.8341286844.

Subtracting from 936421 its sum of digits (25), we obtain a triangular number (936396 = T₁₃₆₈).

The spelling of 936421 in words is "nine hundred thirty-six thousand, four hundred twenty-one".