400000307940 has 192 divisors, whose sum is σ = 1285320960000. Its totient is φ = 103167060480.

The previous prime is 400000307939. The next prime is 400000307963. The reversal of 400000307940 is 49703000004.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 34629286 + ... + 34640834.

It is an arithmetic number, because the mean of its divisors is an integer number (6694380000).

Almost surely, 2^400000307940 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 400000307940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (642660480000).

400000307940 is an abundant number, since it is smaller than the sum of its proper divisors (885320652060).

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

400000307940 is a wasteful number, since it uses less digits than its factorization.

400000307940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13667 (or 13659 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

Adding to 400000307940 its reverse (49703000004), we get a palindrome (449703307944).

The spelling of 400000307940 in words is "four hundred billion, three hundred seven thousand, nine hundred forty".