400744 has 8 divisors (see below), whose sum is σ = 751410. Its totient is φ = 200368.

The previous prime is 400739. The next prime is 400753. The reversal of 400744 is 447004.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 396900 + 3844 = 630^2 + 62^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25039 + ... + 25054.

2⁴⁰⁰⁷⁴⁴ is an apocalyptic number.

It is an amenable number.

400744 is a deficient number, since it is larger than the sum of its proper divisors (350666).

400744 is a wasteful number, since it uses less digits than its factorization.

400744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50099 (or 50095 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 19.

The square root of 400744 is about 633.0434424271. The cubic root of 400744 is about 73.7262836698.

Adding to 400744 its reverse (447004), we get a palindrome (847748).

The spelling of 400744 in words is "four hundred thousand, seven hundred forty-four", and thus it is an iban number.