401890801 has 4 divisors (see below), whose sum is σ = 432805492. Its totient is φ = 370976112.

The previous prime is 401890777. The next prime is 401890837. The reversal of 401890801 is 108098104.

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 201640000 + 200250801 = 14200^2 + 14151^2 .

It is not a de Polignac number, because 401890801 - 2⁹ = 401890289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401890861) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 15457326 + ... + 15457351.

It is an arithmetic number, because the mean of its divisors is an integer number (108201373).

Almost surely, 2^401890801 is an apocalyptic number.

It is an amenable number.

401890801 is a deficient number, since it is larger than the sum of its proper divisors (30914691).

401890801 is a wasteful number, since it uses less digits than its factorization.

401890801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30914690.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 401890801 is about 20047.2142952581. The cubic root of 401890801 is about 737.9654369675.

The spelling of 401890801 in words is "four hundred one million, eight hundred ninety thousand, eight hundred one".