236403421 has 4 divisors (see below), whose sum is σ = 236436732. Its totient is φ = 236370112.

The previous prime is 236403413. The next prime is 236403449. The reversal of 236403421 is 124304632.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 134676025 + 101727396 = 11605^2 + 10086^2 .

It is a cyclic number.

It is not a de Polignac number, because 236403421 - 2³ = 236403413 is a prime.

It is a super-3 number, since 3×236403421³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (236403481) 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 3 ways as a sum of consecutive naturals, for example, 1276 + ... + 21781.

It is an arithmetic number, because the mean of its divisors is an integer number (59109183).

Almost surely, 2^236403421 is an apocalyptic number.

It is an amenable number.

236403421 is a deficient number, since it is larger than the sum of its proper divisors (33311).

236403421 is a wasteful number, since it uses less digits than its factorization.

236403421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33310.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 236403421 is about 15375.4161244501. The cubic root of 236403421 is about 618.3265843662.

The spelling of 236403421 in words is "two hundred thirty-six million, four hundred three thousand, four hundred twenty-one".