400340343 has 32 divisors (see below), whose sum is σ = 586432000. Its totient is φ = 241439616.

The previous prime is 400340341. The next prime is 400340351. The reversal of 400340343 is 343043004.

It is not a de Polignac number, because 400340343 - 2¹ = 400340341 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 (400340341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 911718 + ... + 912156.

It is an arithmetic number, because the mean of its divisors is an integer number (18326000).

Almost surely, 2^400340343 is an apocalyptic number.

400340343 is a deficient number, since it is larger than the sum of its proper divisors (186091657).

400340343 is a wasteful number, since it uses less digits than its factorization.

400340343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871.

The product of its (nonzero) digits is 1728, while the sum is 21.

The square root of 400340343 is about 20008.5067658734. The cubic root of 400340343 is about 737.0152128762.

Adding to 400340343 its reverse (343043004), we get a palindrome (743383347).

The spelling of 400340343 in words is "four hundred million, three hundred forty thousand, three hundred forty-three".