143400821 has 8 divisors (see below), whose sum is σ = 147144984. Its totient is φ = 139668480.

The previous prime is 143400811. The next prime is 143400833. The reversal of 143400821 is 128004341.

143400821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 196 + 143400625 = 14^2 + 11975^2 .

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 143400821 - 2⁶ = 143400757 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 (143400811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24995 + ... + 30191.

It is an arithmetic number, because the mean of its divisors is an integer number (18393123).

Almost surely, 2^143400821 is an apocalyptic number.

It is an amenable number.

143400821 is a deficient number, since it is larger than the sum of its proper divisors (3744163).

143400821 is an equidigital number, since it uses as much as digits as its factorization.

143400821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5911.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 143400821 is about 11975.0081837133. The cubic root of 143400821 is about 523.4202805848.

The spelling of 143400821 in words is "one hundred forty-three million, four hundred thousand, eight hundred twenty-one".