400073 has 4 divisors (see below), whose sum is σ = 403920. Its totient is φ = 396228.

The previous prime is 400069. The next prime is 400087. The reversal of 400073 is 370004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 400073 - 2² = 400069 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400033) 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, 1763 + ... + 1976.

It is an arithmetic number, because the mean of its divisors is an integer number (100980).

2⁴⁰⁰⁰⁷³ is an apocalyptic number.

It is an amenable number.

400073 is a deficient number, since it is larger than the sum of its proper divisors (3847).

400073 is a wasteful number, since it uses less digits than its factorization.

400073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3846.

The product of its (nonzero) digits is 84, while the sum is 14.

The square root of 400073 is about 632.5132409681. The cubic root of 400073 is about 73.6851119385.

Adding to 400073 its reverse (370004), we get a palindrome (770077).

It can be divided in two parts, 40007 and 3, that multiplied together give a palindrome (120021).

The spelling of 400073 in words is "four hundred thousand, seventy-three", and thus it is an iban number.