400302493 has 2 divisors, whose sum is σ = 400302494. Its totient is φ = 400302492.

The previous prime is 400302439. The next prime is 400302499. The reversal of 400302493 is 394203004.

Together with previous prime (400302439) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 395731449 + 4571044 = 19893^2 + 2138^2 .

It is a cyclic number.

It is not a de Polignac number, because 400302493 - 2²⁵ = 366748061 is a prime.

It is a super-3 number, since 3×400302493³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400302499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200151246 + 200151247.

It is an arithmetic number, because the mean of its divisors is an integer number (200151247).

Almost surely, 2^400302493 is an apocalyptic number.

It is an amenable number.

400302493 is a deficient number, since it is larger than the sum of its proper divisors (1).

400302493 is an equidigital number, since it uses as much as digits as its factorization.

400302493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 400302493 is about 20007.5608958214. The cubic root of 400302493 is about 736.9919852188.

Adding to 400302493 its reverse (394203004), we get a palindrome (794505497).

The spelling of 400302493 in words is "four hundred million, three hundred two thousand, four hundred ninety-three".