401840620280 has 64 divisors (see below), whose sum is σ = 986420090880. Its totient is φ = 146111414400.

The previous prime is 401840620273. The next prime is 401840620301. The reversal of 401840620280 is 82026048104.

It is a Cunningham number, because it is equal to 633909²-1.

It is a super-2 number, since 2×401840620280² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 401840620280.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6307385 + ... + 6370775.

It is an arithmetic number, because the mean of its divisors is an integer number (15412813920).

Almost surely, 2^401840620280 is an apocalyptic number.

401840620280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

401840620280 is an abundant number, since it is smaller than the sum of its proper divisors (584579470600).

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

401840620280 is a wasteful number, since it uses less digits than its factorization.

401840620280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77820 (or 77816 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 35.

Adding to 401840620280 its reverse (82026048104), we get a palindrome (483866668384).

The spelling of 401840620280 in words is "four hundred one billion, eight hundred forty million, six hundred twenty thousand, two hundred eighty".