401940013 has 2 divisors, whose sum is σ = 401940014. Its totient is φ = 401940012.

The previous prime is 401939999. The next prime is 401940031. The reversal of 401940013 is 310049104.

Together with next prime (401940031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 254147364 + 147792649 = 15942^2 + 12157^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401940013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401940073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200970006 + 200970007.

It is an arithmetic number, because the mean of its divisors is an integer number (200970007).

Almost surely, 2^401940013 is an apocalyptic number.

It is an amenable number.

401940013 is a deficient number, since it is larger than the sum of its proper divisors (1).

401940013 is an equidigital number, since it uses as much as digits as its factorization.

401940013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 401940013 is about 20048.4416601391. The cubic root of 401940013 is about 737.9955573159.

Adding to 401940013 its reverse (310049104), we get a palindrome (711989117).

The spelling of 401940013 in words is "four hundred one million, nine hundred forty thousand, thirteen".