143401409 has 4 divisors (see below), whose sum is σ = 151836804. Its totient is φ = 134966016.

The previous prime is 143401387. The next prime is 143401429. The reversal of 143401409 is 904104341.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 111365809 + 32035600 = 10553^2 + 5660^2 .

It is a cyclic number.

It is not a de Polignac number, because 143401409 - 2²⁴ = 126624193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (143401429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4217672 + ... + 4217705.

It is an arithmetic number, because the mean of its divisors is an integer number (37959201).

Almost surely, 2^143401409 is an apocalyptic number.

It is an amenable number.

143401409 is a deficient number, since it is larger than the sum of its proper divisors (8435395).

143401409 is an equidigital number, since it uses as much as digits as its factorization.

143401409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8435394.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 143401409 is about 11975.0327348196. The cubic root of 143401409 is about 523.4209959938.

The spelling of 143401409 in words is "one hundred forty-three million, four hundred one thousand, four hundred nine".