400813748 has 12 divisors (see below), whose sum is σ = 720381732. Its totient is φ = 194990400.

The previous prime is 400813741. The next prime is 400813771. The reversal of 400813748 is 847318004.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 194546704 + 206267044 = 13948^2 + 14362^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400813741) 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 in 3 ways as a sum of consecutive naturals, for example, 1353953 + ... + 1354248.

It is an arithmetic number, because the mean of its divisors is an integer number (60031811).

Almost surely, 2^400813748 is an apocalyptic number.

It is an amenable number.

400813748 is a deficient number, since it is larger than the sum of its proper divisors (319567984).

400813748 is a wasteful number, since it uses less digits than its factorization.

400813748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2708242 (or 2708240 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 400813748 is about 20020.3333638579. Note that the first 4 decimals coincide. The cubic root of 400813748 is about 737.3056068332.

The spelling of 400813748 in words is "four hundred million, eight hundred thirteen thousand, seven hundred forty-eight".