400340320 has 48 divisors (see below), whose sum is σ = 967816080. Its totient is φ = 156409344.

The previous prime is 400340261. The next prime is 400340329. The reversal of 400340320 is 23043004.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 400340294 and 400340303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400340329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22215 + ... + 35974.

It is an arithmetic number, because the mean of its divisors is an integer number (20162835).

Almost surely, 2^400340320 is an apocalyptic number.

400340320 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400340320 is an abundant number, since it is smaller than the sum of its proper divisors (567475760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400340320 is a wasteful number, since it uses less digits than its factorization.

400340320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58247 (or 58239 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 400340320 is about 20008.5061911178. The cubic root of 400340320 is about 737.0151987621.

Adding to 400340320 its reverse (23043004), we get a palindrome (423383324).

The spelling of 400340320 in words is "four hundred million, three hundred forty thousand, three hundred twenty".