400040737400 has 48 divisors (see below), whose sum is σ = 931203680400. Its totient is φ = 159825505280.

The previous prime is 400040737381. The next prime is 400040737403. The reversal of 400040737400 is 4737040004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400040737403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1024217 + ... + 1359816.

It is an arithmetic number, because the mean of its divisors is an integer number (19400076675).

Almost surely, 2^400040737400 is an apocalyptic number.

400040737400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400040737400 is an abundant number, since it is smaller than the sum of its proper divisors (531162943000).

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

400040737400 is a wasteful number, since it uses less digits than its factorization.

400040737400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384888 (or 2384879 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 29.

Adding to 400040737400 its reverse (4737040004), we get a palindrome (404777777404).

The spelling of 400040737400 in words is "four hundred billion, forty million, seven hundred thirty-seven thousand, four hundred".