400432541 has 2 divisors, whose sum is σ = 400432542. Its totient is φ = 400432540.

The previous prime is 400432523. The next prime is 400432567. The reversal of 400432541 is 145234004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 256672441 + 143760100 = 16021^2 + 11990^2 .

It is a cyclic number.

It is not a de Polignac number, because 400432541 - 2¹⁴ = 400416157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400432141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200216270 + 200216271.

It is an arithmetic number, because the mean of its divisors is an integer number (200216271).

Almost surely, 2^400432541 is an apocalyptic number.

It is an amenable number.

400432541 is a deficient number, since it is larger than the sum of its proper divisors (1).

400432541 is an equidigital number, since it uses as much as digits as its factorization.

400432541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 400432541 is about 20010.8106032714. The cubic root of 400432541 is about 737.0717865009.

Adding to 400432541 its reverse (145234004), we get a palindrome (545666545).

The spelling of 400432541 in words is "four hundred million, four hundred thirty-two thousand, five hundred forty-one".