400747 has 4 divisors (see below), whose sum is σ = 411616. Its totient is φ = 389880.

The previous prime is 400739. The next prime is 400753. The reversal of 400747 is 747004.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400747 - 2³ = 400739 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5379 + ... + 5452.

It is an arithmetic number, because the mean of its divisors is an integer number (102904).

2⁴⁰⁰⁷⁴⁷ is an apocalyptic number.

400747 is a deficient number, since it is larger than the sum of its proper divisors (10869).

400747 is a wasteful number, since it uses less digits than its factorization.

400747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10868.

The product of its (nonzero) digits is 784, while the sum is 22.

The square root of 400747 is about 633.0458119283. The cubic root of 400747 is about 73.7264676428.

The spelling of 400747 in words is "four hundred thousand, seven hundred forty-seven", and thus it is an iban number.