400397 has 4 divisors (see below), whose sum is σ = 401856. Its totient is φ = 398940.

The previous prime is 400391. The next prime is 400409. The reversal of 400397 is 793004.

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 400397 - 2⁴ = 400381 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 (400391) 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, 179 + ... + 912.

It is an arithmetic number, because the mean of its divisors is an integer number (100464).

2⁴⁰⁰³⁹⁷ is an apocalyptic number.

It is an amenable number.

400397 is a deficient number, since it is larger than the sum of its proper divisors (1459).

400397 is a wasteful number, since it uses less digits than its factorization.

400397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1458.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 400397 is about 632.7693102545. The cubic root of 400397 is about 73.7049979213.

It can be divided in two parts, 400 and 397, that added together give a palindrome (797).

The spelling of 400397 in words is "four hundred thousand, three hundred ninety-seven".