40155840 has 168 divisors, whose sum is σ = 140744448. Its totient is φ = 10506240.

The previous prime is 40155827. The next prime is 40155893. The reversal of 40155840 is 4855104.

It is a super-2 number, since 2×40155840² = 3224982972211200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 210145 + ... + 210335.

Almost surely, 2^40155840 is an apocalyptic number.

40155840 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 40155840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70372224).

40155840 is an abundant number, since it is smaller than the sum of its proper divisors (100588608).

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

40155840 is a wasteful number, since it uses less digits than its factorization.

40155840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 40155840 is about 6336.8635775121. The cubic root of 40155840 is about 342.4387515462.

The spelling of 40155840 in words is "forty million, one hundred fifty-five thousand, eight hundred forty".