402143231440 has 20 divisors (see below), whose sum is σ = 934983013284. Its totient is φ = 160857292544.

The previous prime is 402143231437. The next prime is 402143231443. The reversal of 402143231440 is 44132341204.

It is an interprime number because it is at equal distance from previous prime (402143231437) and next prime (402143231443).

It can be written as a sum of positive squares in 2 ways, for example, as 286657443216 + 115485788224 = 535404^2 + 339832^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 402143231399 and 402143231408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402143231443) 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, 2513395117 + ... + 2513395276.

Almost surely, 2^402143231440 is an apocalyptic number.

402143231440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

402143231440 is an abundant number, since it is smaller than the sum of its proper divisors (532839781844).

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

402143231440 is a wasteful number, since it uses less digits than its factorization.

402143231440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5026790406 (or 5026790400 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 402143231440 its reverse (44132341204), we get a palindrome (446275572644).

The spelling of 402143231440 in words is "four hundred two billion, one hundred forty-three million, two hundred thirty-one thousand, four hundred forty".