400039933 has 2 divisors, whose sum is σ = 400039934. Its totient is φ = 400039932.

The previous prime is 400039907. The next prime is 400039961. The reversal of 400039933 is 339930004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 297666009 + 102373924 = 17253^2 + 10118^2 .

It is a cyclic number.

It is not a de Polignac number, because 400039933 - 2²¹ = 397942781 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400039895 and 400039904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400039973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200019966 + 200019967.

It is an arithmetic number, because the mean of its divisors is an integer number (200019967).

Almost surely, 2^400039933 is an apocalyptic number.

It is an amenable number.

400039933 is a deficient number, since it is larger than the sum of its proper divisors (1).

400039933 is an equidigital number, since it uses as much as digits as its factorization.

400039933 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 31.

The square root of 400039933 is about 20000.9983000849. The cubic root of 400039933 is about 736.8308179838.

Adding to 400039933 its reverse (339930004), we get a palindrome (739969937).

The spelling of 400039933 in words is "four hundred million, thirty-nine thousand, nine hundred thirty-three".