400994123 has 4 divisors (see below), whose sum is σ = 411831840. Its totient is φ = 390156408.

The previous prime is 400994119. The next prime is 400994137. The reversal of 400994123 is 321499004.

It is a happy number.

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 400994123 - 2² = 400994119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400994123.

It is not an unprimeable number, because it can be changed into a prime (400934123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5418803 + ... + 5418876.

It is an arithmetic number, because the mean of its divisors is an integer number (102957960).

Almost surely, 2^400994123 is an apocalyptic number.

400994123 is a deficient number, since it is larger than the sum of its proper divisors (10837717).

400994123 is a wasteful number, since it uses less digits than its factorization.

400994123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10837716.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 400994123 is about 20024.8376522757. The cubic root of 400994123 is about 737.4161914915.

The spelling of 400994123 in words is "four hundred million, nine hundred ninety-four thousand, one hundred twenty-three".