400343123 has 4 divisors (see below), whose sum is σ = 400572480. Its totient is φ = 400113768.

The previous prime is 400343117. The next prime is 400343131. The reversal of 400343123 is 321343004.

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 400343123 - 2⁶ = 400343059 is a prime.

It is a super-2 number, since 2×400343123² = 320549232266786258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400343095 and 400343104.

It is not an unprimeable number, because it can be changed into a prime (400342123) 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, 112040 + ... + 115557.

It is an arithmetic number, because the mean of its divisors is an integer number (100143120).

Almost surely, 2^400343123 is an apocalyptic number.

400343123 is a deficient number, since it is larger than the sum of its proper divisors (229357).

400343123 is a wasteful number, since it uses less digits than its factorization.

400343123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229356.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 400343123 is about 20008.5762362043. The cubic root of 400343123 is about 737.0169188393.

Adding to 400343123 its reverse (321343004), we get a palindrome (721686127).

The spelling of 400343123 in words is "four hundred million, three hundred forty-three thousand, one hundred twenty-three".