402143022 has 64 divisors (see below), whose sum is σ = 914457600. Its totient is φ = 130965120.

The previous prime is 402142991. The next prime is 402143023. The reversal of 402143022 is 220341204.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 402142986 and 402143004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402143023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 456022 + ... + 456902.

It is an arithmetic number, because the mean of its divisors is an integer number (14288400).

Almost surely, 2^402143022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402143022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (457228800).

402143022 is an abundant number, since it is smaller than the sum of its proper divisors (512314578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402143022 is a wasteful number, since it uses less digits than its factorization.

402143022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078 (or 1072 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 402143022 is about 20053.5039830948. The cubic root of 402143022 is about 738.1197835844.

Adding to 402143022 its reverse (220341204), we get a palindrome (622484226).

The spelling of 402143022 in words is "four hundred two million, one hundred forty-three thousand, twenty-two".