401940641 has 4 divisors (see below), whose sum is σ = 402158484. Its totient is φ = 401722800.

The previous prime is 401940631. The next prime is 401940647. The reversal of 401940641 is 146049104.

It is a happy number.

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 95550625 + 306390016 = 9775^2 + 17504^2 .

It is a cyclic number.

It is not a de Polignac number, because 401940641 - 2⁶ = 401940577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401940647) 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, 106130 + ... + 109851.

It is an arithmetic number, because the mean of its divisors is an integer number (100539621).

Almost surely, 2^401940641 is an apocalyptic number.

It is an amenable number.

401940641 is a deficient number, since it is larger than the sum of its proper divisors (217843).

401940641 is a wasteful number, since it uses less digits than its factorization.

401940641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217842.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 401940641 is about 20048.4573221981. The cubic root of 401940641 is about 737.9959416693.

Adding to 401940641 its reverse (146049104), we get a palindrome (547989745).

The spelling of 401940641 in words is "four hundred one million, nine hundred forty thousand, six hundred forty-one".