143409921 has 8 divisors (see below), whose sum is σ = 191727360. Its totient is φ = 95349552.

The previous prime is 143409919. The next prime is 143409971. The reversal of 143409921 is 129904341.

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

It is not a de Polignac number, because 143409921 - 2¹ = 143409919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (143409911) 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, 62961 + ... + 65198.

It is an arithmetic number, because the mean of its divisors is an integer number (23965920).

Almost surely, 2^143409921 is an apocalyptic number.

It is an amenable number.

143409921 is a deficient number, since it is larger than the sum of its proper divisors (48317439).

143409921 is a wasteful number, since it uses less digits than its factorization.

143409921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128535.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 143409921 is about 11975.3881356723. The cubic root of 143409921 is about 523.4313521714.

The spelling of 143409921 in words is "one hundred forty-three million, four hundred nine thousand, nine hundred twenty-one".