143421706 has 4 divisors (see below), whose sum is σ = 215132562. Its totient is φ = 71710852.

The previous prime is 143421703. The next prime is 143421737. The reversal of 143421706 is 607124341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 607124341 = 151 ⋅4020691.

It can be written as a sum of positive squares in only one way, i.e., 89472681 + 53949025 = 9459^2 + 7345^2 .

It is not an unprimeable number, because it can be changed into a prime (143421703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35855425 + ... + 35855428.

Almost surely, 2^143421706 is an apocalyptic number.

143421706 is a deficient number, since it is larger than the sum of its proper divisors (71710856).

143421706 is an equidigital number, since it uses as much as digits as its factorization.

143421706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71710855.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 143421706 is about 11975.8801764213. The cubic root of 143421706 is about 523.4456897882.

The spelling of 143421706 in words is "one hundred forty-three million, four hundred twenty-one thousand, seven hundred six".