402171208440 has 192 divisors, whose sum is σ = 1260528579360. Its totient is φ = 102574586880.

The previous prime is 402171208429. The next prime is 402171208507. The reversal of 402171208440 is 44802171204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15442630 + ... + 15468650.

Almost surely, 2^402171208440 is an apocalyptic number.

402171208440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402171208440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (630264289680).

402171208440 is an abundant number, since it is smaller than the sum of its proper divisors (858357370920).

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

402171208440 is a wasteful number, since it uses less digits than its factorization.

402171208440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26190 (or 26127 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 33.

Adding to 402171208440 its reverse (44802171204), we get a palindrome (446973379644).

The spelling of 402171208440 in words is "four hundred two billion, one hundred seventy-one million, two hundred eight thousand, four hundred forty".