401966538 has 64 divisors (see below), whose sum is σ = 856915200. Its totient is φ = 125447168.

The previous prime is 401966533. The next prime is 401966549. The reversal of 401966538 is 835669104.

It is a self number, because there is not a number n which added to its sum of digits gives 401966538.

It is not an unprimeable number, because it can be changed into a prime (401966533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2323420 + ... + 2323592.

It is an arithmetic number, because the mean of its divisors is an integer number (13389300).

Almost surely, 2^401966538 is an apocalyptic number.

401966538 is an abundant number, since it is smaller than the sum of its proper divisors (454948662).

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

401966538 is a wasteful number, since it uses less digits than its factorization.

401966538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463.

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 401966538 is about 20049.1031719626. The cubic root of 401966538 is about 738.0117910000.

The spelling of 401966538 in words is "four hundred one million, nine hundred sixty-six thousand, five hundred thirty-eight".