400940340 has 48 divisors (see below), whose sum is σ = 1128865920. Its totient is φ = 106323840.

The previous prime is 400940333. The next prime is 400940363. The reversal of 400940340 is 43049004.

It is a self number, because there is not a number n which added to its sum of digits gives 400940340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7600 + ... + 29319.

It is an arithmetic number, because the mean of its divisors is an integer number (23518040).

Almost surely, 2^400940340 is an apocalyptic number.

It is an amenable number.

400940340 is an abundant number, since it is smaller than the sum of its proper divisors (727925580).

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

400940340 is a wasteful number, since it uses less digits than its factorization.

400940340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37112 (or 37110 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 400940340 is about 20023.4946999768. The cubic root of 400940340 is about 737.3832215750.

Adding to 400940340 its reverse (43049004), we get a palindrome (443989344).

The spelling of 400940340 in words is "four hundred million, nine hundred forty thousand, three hundred forty".