143400421 has 4 divisors (see below), whose sum is σ = 143518144. Its totient is φ = 143282700.

The previous prime is 143400401. The next prime is 143400427. The reversal of 143400421 is 124004341.

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: 124004341 = 17 ⋅7294373.

It is a cyclic number.

It is not a de Polignac number, because 143400421 - 2⁷ = 143400293 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 (143400427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57015 + ... + 59476.

It is an arithmetic number, because the mean of its divisors is an integer number (35879536).

Almost surely, 2^143400421 is an apocalyptic number.

It is an amenable number.

143400421 is a deficient number, since it is larger than the sum of its proper divisors (117723).

143400421 is a wasteful number, since it uses less digits than its factorization.

143400421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117722.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 143400421 is about 11974.9914822517. The cubic root of 143400421 is about 523.4197939109.

Adding to 143400421 its reverse (124004341), we get a palindrome (267404762).

The spelling of 143400421 in words is "one hundred forty-three million, four hundred thousand, four hundred twenty-one".