40400121400 has 48 divisors (see below), whose sum is σ = 94019306040. Its totient is φ = 16144732800.

The previous prime is 40400121379. The next prime is 40400121431. The reversal of 40400121400 is 412100404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117007 + ... + 307393.

Almost surely, 2^40400121400 is an apocalyptic number.

40400121400 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40400121400 is an abundant number, since it is smaller than the sum of its proper divisors (53619184640).

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

40400121400 is a wasteful number, since it uses less digits than its factorization.

40400121400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191464 (or 191455 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 40400121400 its reverse (412100404), we get a palindrome (40812221804).

The spelling of 40400121400 in words is "forty billion, four hundred million, one hundred twenty-one thousand, four hundred".