400487749 has 2 divisors, whose sum is σ = 400487750. Its totient is φ = 400487748.

The previous prime is 400487671. The next prime is 400487777. The reversal of 400487749 is 947784004.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 287065249 + 113422500 = 16943^2 + 10650^2 .

It is a cyclic number.

It is not a de Polignac number, because 400487749 - 2⁹ = 400487237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400487779) 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, 200243874 + 200243875.

It is an arithmetic number, because the mean of its divisors is an integer number (200243875).

Almost surely, 2^400487749 is an apocalyptic number.

It is an amenable number.

400487749 is a deficient number, since it is larger than the sum of its proper divisors (1).

400487749 is an equidigital number, since it uses as much as digits as its factorization.

400487749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 400487749 is about 20012.1900100913. The cubic root of 400487749 is about 737.1056585310.

The spelling of 400487749 in words is "four hundred million, four hundred eighty-seven thousand, seven hundred forty-nine".