400786013 has 2 divisors, whose sum is σ = 400786014. Its totient is φ = 400786012.

The previous prime is 400785907. The next prime is 400786021. The reversal of 400786013 is 310687004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 249545209 + 151240804 = 15797^2 + 12298^2 .

It is a cyclic number.

It is not a de Polignac number, because 400786013 - 2¹² = 400781917 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400786093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200393006 + 200393007.

It is an arithmetic number, because the mean of its divisors is an integer number (200393007).

Almost surely, 2^400786013 is an apocalyptic number.

It is an amenable number.

400786013 is a deficient number, since it is larger than the sum of its proper divisors (1).

400786013 is an equidigital number, since it uses as much as digits as its factorization.

400786013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 400786013 is about 20019.6406810912. The cubic root of 400786013 is about 737.2886000623.

Subtracting from 400786013 its reverse (310687004), we obtain a palindrome (90099009).

The spelling of 400786013 in words is "four hundred million, seven hundred eighty-six thousand, thirteen".