143978431 has 4 divisors (see below), whose sum is σ = 144002872. Its totient is φ = 143953992.

The previous prime is 143978407. The next prime is 143978453. The reversal of 143978431 is 134879341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134879341 = 3533 ⋅38177.

It is a cyclic number.

It is not a de Polignac number, because 143978431 - 2⁵ = 143978399 is a prime.

It is a super-2 number, since 2×143978431² = 41459577186443522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143972431) 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, 2641 + ... + 17173.

It is an arithmetic number, because the mean of its divisors is an integer number (36000718).

Almost surely, 2^143978431 is an apocalyptic number.

143978431 is a deficient number, since it is larger than the sum of its proper divisors (24441).

143978431 is an equidigital number, since it uses as much as digits as its factorization.

143978431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24440.

The product of its digits is 72576, while the sum is 40.

The square root of 143978431 is about 11999.1012580110. The cubic root of 143978431 is about 524.1221077336.

The spelling of 143978431 in words is "one hundred forty-three million, nine hundred seventy-eight thousand, four hundred thirty-one".