401555140 has 24 divisors (see below), whose sum is σ = 963732672. Its totient is φ = 137676000.

The previous prime is 401555129. The next prime is 401555173. The reversal of 401555140 is 41555104.

It is a happy number.

401555140 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×401555140² = 322493060920839200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1433986 + ... + 1434265.

It is an arithmetic number, because the mean of its divisors is an integer number (40155528).

Almost surely, 2^401555140 is an apocalyptic number.

It is an amenable number.

401555140 is an abundant number, since it is smaller than the sum of its proper divisors (562177532).

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

401555140 is a wasteful number, since it uses less digits than its factorization.

401555140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2868267 (or 2868265 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 401555140 is about 20038.8407848358. The cubic root of 401555140 is about 737.7599290619.

The spelling of 401555140 in words is "four hundred one million, five hundred fifty-five thousand, one hundred forty".