402242143 has 4 divisors (see below), whose sum is σ = 415217728. Its totient is φ = 389266560.

The previous prime is 402242131. The next prime is 402242149. The reversal of 402242143 is 341242204.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 402242143 - 2²¹ = 400144991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402242149) 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, 6487746 + ... + 6487807.

It is an arithmetic number, because the mean of its divisors is an integer number (103804432).

Almost surely, 2^402242143 is an apocalyptic number.

402242143 is a deficient number, since it is larger than the sum of its proper divisors (12975585).

402242143 is a wasteful number, since it uses less digits than its factorization.

402242143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12975584.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 402242143 is about 20055.9752443006. The cubic root of 402242143 is about 738.1804230060.

Adding to 402242143 its reverse (341242204), we get a palindrome (743484347).

The spelling of 402242143 in words is "four hundred two million, two hundred forty-two thousand, one hundred forty-three".