40155997440 has 288 divisors, whose sum is σ = 140388264576. Its totient is φ = 9721774080.

The previous prime is 40155997439. The next prime is 40155997471. The reversal of 40155997440 is 4479955104.

It is a happy number.

It is a super-2 number, since 2×40155997440² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 40155997440.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 3038527 + ... + 3051713.

It is an arithmetic number, because the mean of its divisors is an integer number (487459252).

Almost surely, 2^40155997440 is an apocalyptic number.

40155997440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40155997440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70194132288).

40155997440 is an abundant number, since it is smaller than the sum of its proper divisors (100232267136).

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

40155997440 is a wasteful number, since it uses less digits than its factorization.

40155997440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13285 (or 13271 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 48.

The spelling of 40155997440 in words is "forty billion, one hundred fifty-five million, nine hundred ninety-seven thousand, four hundred forty".