402444143 has 8 divisors (see below), whose sum is σ = 411166080. Its totient is φ = 393802200.

The previous prime is 402444137. The next prime is 402444157. The reversal of 402444143 is 341444204.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 402444143 - 2¹⁴ = 402427759 is a prime.

It is a super-2 number, since 2×402444143² = 323922576470008898, 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 (402444103) 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, 9773 + ... + 30006.

It is an arithmetic number, because the mean of its divisors is an integer number (51395760).

Almost surely, 2^402444143 is an apocalyptic number.

402444143 is a deficient number, since it is larger than the sum of its proper divisors (8721937).

402444143 is a wasteful number, since it uses less digits than its factorization.

402444143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39997.

The product of its (nonzero) digits is 6144, while the sum is 26.

The square root of 402444143 is about 20061.0105179176. The cubic root of 402444143 is about 738.3039700570.

Adding to 402444143 its reverse (341444204), we get a palindrome (743888347).

The spelling of 402444143 in words is "four hundred two million, four hundred forty-four thousand, one hundred forty-three".