400047 has 4 divisors (see below), whose sum is σ = 533400. Its totient is φ = 266696.

The previous prime is 400033. The next prime is 400051. The reversal of 400047 is 740004.

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 400047 - 2⁴ = 400031 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 399999 and 400035.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400067) 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, 66672 + ... + 66677.

It is an arithmetic number, because the mean of its divisors is an integer number (133350).

2⁴⁰⁰⁰⁴⁷ is an apocalyptic number.

400047 is a deficient number, since it is larger than the sum of its proper divisors (133353).

400047 is a wasteful number, since it uses less digits than its factorization.

400047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133352.

The product of its (nonzero) digits is 112, while the sum is 15.

The square root of 400047 is about 632.4926877048. The cubic root of 400047 is about 73.6835156845.

The spelling of 400047 in words is "four hundred thousand, forty-seven", and thus it is an iban number.