400731493 has 2 divisors, whose sum is σ = 400731494. Its totient is φ = 400731492.

The previous prime is 400731473. The next prime is 400731503. The reversal of 400731493 is 394137004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 280127169 + 120604324 = 16737^2 + 10982^2 .

It is a cyclic number.

It is not a de Polignac number, because 400731493 - 2²⁵ = 367177061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400731433) 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 as a sum of consecutive naturals, namely, 200365746 + 200365747.

It is an arithmetic number, because the mean of its divisors is an integer number (200365747).

Almost surely, 2^400731493 is an apocalyptic number.

It is an amenable number.

400731493 is a deficient number, since it is larger than the sum of its proper divisors (1).

400731493 is an equidigital number, since it uses as much as digits as its factorization.

400731493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 400731493 is about 20018.2789719796. The cubic root of 400731493 is about 737.2551667621.

Adding to 400731493 its reverse (394137004), we get a palindrome (794868497).

The spelling of 400731493 in words is "four hundred million, seven hundred thirty-one thousand, four hundred ninety-three".