401181138 has 18 divisors (see below), whose sum is σ = 869409957. Its totient is φ = 133698720.

The previous prime is 401181133. The next prime is 401181139. The reversal of 401181138 is 831181104.

It can be written as a sum of positive squares in 2 ways, for example, as 400520169 + 660969 = 20013^2 + 813^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=14163.

It is not an unprimeable number, because it can be changed into a prime (401181133) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 82618 + ... + 87338.

Almost surely, 2^401181138 is an apocalyptic number.

401181138 is an abundant number, since it is smaller than the sum of its proper divisors (468228819).

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

401181138 is an frugal number, since it uses more digits than its factorization.

401181138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9450 (or 4726 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 401181138 is about 20029.5066838901. The cubic root of 401181138 is about 737.5308120039.

The spelling of 401181138 in words is "four hundred one million, one hundred eighty-one thousand, one hundred thirty-eight".