400433491 has 2 divisors, whose sum is σ = 400433492. Its totient is φ = 400433490.

The previous prime is 400433471. The next prime is 400433507. The reversal of 400433491 is 194334004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400433491 - 2⁹ = 400432979 is a prime.

It is not a weakly prime, because it can be changed into another prime (400433471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200216745 + 200216746.

It is an arithmetic number, because the mean of its divisors is an integer number (200216746).

Almost surely, 2^400433491 is an apocalyptic number.

400433491 is a deficient number, since it is larger than the sum of its proper divisors (1).

400433491 is an equidigital number, since it uses as much as digits as its factorization.

400433491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 400433491 is about 20010.8343404267. The cubic root of 400433491 is about 737.0723693853.

Adding to 400433491 its reverse (194334004), we get a palindrome (594767495).

It can be divided in two parts, 40043 and 3491, that added together give a palindrome (43534).

The spelling of 400433491 in words is "four hundred million, four hundred thirty-three thousand, four hundred ninety-one".