400342405 has 8 divisors (see below), whose sum is σ = 493395192. Its totient is φ = 311617728.

The previous prime is 400342399. The next prime is 400342433. The reversal of 400342405 is 504243004.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 218389284 + 181953121 = 14778^2 + 13489^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400342405 - 2¹¹ = 400340357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1081822 + ... + 1082191.

It is an arithmetic number, because the mean of its divisors is an integer number (61674399).

Almost surely, 2^400342405 is an apocalyptic number.

It is an amenable number.

400342405 is a deficient number, since it is larger than the sum of its proper divisors (93052787).

400342405 is a wasteful number, since it uses less digits than its factorization.

400342405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2164055.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 400342405 is about 20008.5582938901. The cubic root of 400342405 is about 737.0164782352.

Adding to 400342405 its reverse (504243004), we get a palindrome (904585409).

The spelling of 400342405 in words is "four hundred million, three hundred forty-two thousand, four hundred five".