143976985 has 4 divisors (see below), whose sum is σ = 172772388. Its totient is φ = 115181584.

The previous prime is 143976949. The next prime is 143976997. The reversal of 143976985 is 589679341.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 589679341 = 2671 ⋅220771.

It can be written as a sum of positive squares in 2 ways, for example, as 56610576 + 87366409 = 7524^2 + 9347^2 .

It is a cyclic number.

It is not a de Polignac number, because 143976985 - 2¹³ = 143968793 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14397694 + ... + 14397703.

It is an arithmetic number, because the mean of its divisors is an integer number (43193097).

Almost surely, 2^143976985 is an apocalyptic number.

It is an amenable number.

143976985 is a deficient number, since it is larger than the sum of its proper divisors (28795403).

143976985 is an equidigital number, since it uses as much as digits as its factorization.

143976985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28795402.

The product of its digits is 1632960, while the sum is 52.

The square root of 143976985 is about 11999.0410033469. The cubic root of 143976985 is about 524.1203531118.

The spelling of 143976985 in words is "one hundred forty-three million, nine hundred seventy-six thousand, nine hundred eighty-five".