400232993 has 2 divisors, whose sum is σ = 400232994. Its totient is φ = 400232992.

The previous prime is 400232983. The next prime is 400232999. The reversal of 400232993 is 399232004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 363169249 + 37063744 = 19057^2 + 6088^2 .

It is a cyclic number.

It is not a de Polignac number, because 400232993 - 2⁴ = 400232977 is a prime.

It is not a weakly prime, because it can be changed into another prime (400232999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200116496 + 200116497.

It is an arithmetic number, because the mean of its divisors is an integer number (200116497).

Almost surely, 2^400232993 is an apocalyptic number.

It is an amenable number.

400232993 is a deficient number, since it is larger than the sum of its proper divisors (1).

400232993 is an equidigital number, since it uses as much as digits as its factorization.

400232993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 400232993 is about 20005.8239770323. The cubic root of 400232993 is about 736.9493308858.

Adding to 400232993 its reverse (399232004), we get a palindrome (799464997).

The spelling of 400232993 in words is "four hundred million, two hundred thirty-two thousand, nine hundred ninety-three".