40187840 has 168 divisors, whose sum is σ = 121962672. Its totient is φ = 12472320.

The previous prime is 40187821. The next prime is 40187857. The reversal of 40187840 is 4878104.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 40187797 and 40187806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 172364 + ... + 172596.

Almost surely, 2^40187840 is an apocalyptic number.

40187840 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 40187840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60981336).

40187840 is an abundant number, since it is smaller than the sum of its proper divisors (81774832).

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

40187840 is a wasteful number, since it uses less digits than its factorization.

40187840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 40187840 is about 6339.3879830785. The cubic root of 40187840 is about 342.5296900044.

The spelling of 40187840 in words is "forty million, one hundred eighty-seven thousand, eight hundred forty".