40000400421985 has 16 divisors (see below), whose sum is σ = 50825737872000. Its totient is φ = 30116941330176.

The previous prime is 40000400421979. The next prime is 40000400422061. The reversal of 40000400421985 is 58912400400004.

It is not a de Polignac number, because 40000400421985 - 2²⁵ = 40000366867553 is a prime.

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, 5307435 + ... + 10400464.

It is an arithmetic number, because the mean of its divisors is an integer number (3176608617000).

Almost surely, 2^{40000400421985} is an apocalyptic number.

It is an amenable number.

40000400421985 is a deficient number, since it is larger than the sum of its proper divisors (10825337450015).

40000400421985 is a wasteful number, since it uses less digits than its factorization.

40000400421985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15737880.

The product of its (nonzero) digits is 46080, while the sum is 37.

Adding to 40000400421985 its reverse (58912400400004), we get a palindrome (98912800821989).

The spelling of 40000400421985 in words is "forty trillion, four hundred million, four hundred twenty-one thousand, nine hundred eighty-five".