400847 has 4 divisors (see below), whose sum is σ = 402696. Its totient is φ = 399000.

The previous prime is 400837. The next prime is 400849. The reversal of 400847 is 748004.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 400847.

It is not an unprimeable number, because it can be changed into a prime (400849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 548 + ... + 1049.

It is an arithmetic number, because the mean of its divisors is an integer number (100674).

2⁴⁰⁰⁸⁴⁷ is an apocalyptic number.

400847 is a deficient number, since it is larger than the sum of its proper divisors (1849).

400847 is a wasteful number, since it uses less digits than its factorization.

400847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1848.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 400847 is about 633.1247902270. The cubic root of 400847 is about 73.7325995528.

The spelling of 400847 in words is "four hundred thousand, eight hundred forty-seven".