401950781 has 4 divisors (see below), whose sum is σ = 409534812. Its totient is φ = 394366752.

The previous prime is 401950733. The next prime is 401950793. The reversal of 401950781 is 187059104.

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 225300100 + 176650681 = 15010^2 + 13291^2 .

It is a cyclic number.

It is not a de Polignac number, because 401950781 - 2¹⁴ = 401934397 is a prime.

It is a super-2 number, since 2×401950781² = 323128860693019922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401950481) 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 3 ways as a sum of consecutive naturals, for example, 3791936 + ... + 3792041.

It is an arithmetic number, because the mean of its divisors is an integer number (102383703).

Almost surely, 2^401950781 is an apocalyptic number.

It is an amenable number.

401950781 is a deficient number, since it is larger than the sum of its proper divisors (7584031).

401950781 is an equidigital number, since it uses as much as digits as its factorization.

401950781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7584030.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 401950781 is about 20048.7102078912. The cubic root of 401950781 is about 738.0021475739.

The spelling of 401950781 in words is "four hundred one million, nine hundred fifty thousand, seven hundred eighty-one".