143745721 has 16 divisors (see below), whose sum is σ = 170438400. Its totient is φ = 118617408.

The previous prime is 143745709. The next prime is 143745731. The reversal of 143745721 is 127547341.

It is not a de Polignac number, because 143745721 - 2⁹ = 143745209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (143745731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88311 + ... + 89923.

It is an arithmetic number, because the mean of its divisors is an integer number (10652400).

Almost surely, 2^143745721 is an apocalyptic number.

It is an amenable number.

143745721 is a deficient number, since it is larger than the sum of its proper divisors (26692679).

143745721 is a wasteful number, since it uses less digits than its factorization.

143745721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2088.

The product of its digits is 23520, while the sum is 34.

The square root of 143745721 is about 11989.4003603183. The cubic root of 143745721 is about 523.8395787794.

The spelling of 143745721 in words is "one hundred forty-three million, seven hundred forty-five thousand, seven hundred twenty-one".