400403340 has 216 divisors, whose sum is σ = 1330907760. Its totient is φ = 97134336.

The previous prime is 400403317. The next prime is 400403351. The reversal of 400403340 is 43304004.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7554754 + ... + 7554806.

It is an arithmetic number, because the mean of its divisors is an integer number (6161610).

Almost surely, 2^400403340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400403340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (665453880).

400403340 is an abundant number, since it is smaller than the sum of its proper divisors (930504420).

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

400403340 is a wasteful number, since it uses less digits than its factorization.

400403340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 400403340 is about 20010.0809593565. The cubic root of 400403340 is about 737.0538694119.

Adding to 400403340 its reverse (43304004), we get a palindrome (443707344).

The spelling of 400403340 in words is "four hundred million, four hundred three thousand, three hundred forty".