400738 has 8 divisors (see below), whose sum is σ = 647388. Its totient is φ = 184944.

The previous prime is 400723. The next prime is 400739. The reversal of 400738 is 837004.

It can be written as a sum of positive squares in 2 ways, for example, as 400689 + 49 = 633^2 + 7^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

400738 is a modest number, since divided by 738 gives 4 as remainder.

It is not an unprimeable number, because it can be changed into a prime (400739) by changing a digit.

400738 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7681 + ... + 7732.

2⁴⁰⁰⁷³⁸ is an apocalyptic number.

400738 is a deficient number, since it is larger than the sum of its proper divisors (246650).

400738 is a wasteful number, since it uses less digits than its factorization.

400738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15428.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 400738 is about 633.0387033981. The cubic root of 400738 is about 73.7259157209.

The spelling of 400738 in words is "four hundred thousand, seven hundred thirty-eight".