236436421 has 8 divisors (see below), whose sum is σ = 257486040. Its totient is φ = 215795712.

The previous prime is 236436413. The next prime is 236436439. The reversal of 236436421 is 124634632.

It can be written as a sum of positive squares in 4 ways, for example, as 37344321 + 199092100 = 6111^2 + 14110^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 236436421 - 2³ = 236436413 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 (236436521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101020 + ... + 103333.

It is an arithmetic number, because the mean of its divisors is an integer number (32185755).

Almost surely, 2^236436421 is an apocalyptic number.

It is an amenable number.

236436421 is a deficient number, since it is larger than the sum of its proper divisors (21049619).

236436421 is a wasteful number, since it uses less digits than its factorization.

236436421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204455.

The product of its digits is 20736, while the sum is 31.

The square root of 236436421 is about 15376.4892286894. The cubic root of 236436421 is about 618.3553541528.

The spelling of 236436421 in words is "two hundred thirty-six million, four hundred thirty-six thousand, four hundred twenty-one".