401995129 has 4 divisors (see below), whose sum is σ = 415857060. Its totient is φ = 388133200.

The previous prime is 401995123. The next prime is 401995147. The reversal of 401995129 is 921599104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 270273600 + 131721529 = 16440^2 + 11477^2 .

It is a cyclic number.

It is not a de Polignac number, because 401995129 - 2⁹ = 401994617 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 401995091 and 401995100.

It is not an unprimeable number, because it can be changed into a prime (401995123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6930922 + ... + 6930979.

It is an arithmetic number, because the mean of its divisors is an integer number (103964265).

Almost surely, 2^401995129 is an apocalyptic number.

It is an amenable number.

401995129 is a deficient number, since it is larger than the sum of its proper divisors (13861931).

401995129 is a wasteful number, since it uses less digits than its factorization.

401995129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13861930.

The product of its (nonzero) digits is 29160, while the sum is 40.

The square root of 401995129 is about 20049.8161836960. The cubic root of 401995129 is about 738.0292883062.

The spelling of 401995129 in words is "four hundred one million, nine hundred ninety-five thousand, one hundred twenty-nine".