40547840 has 80 divisors (see below), whose sum is σ = 99582912. Its totient is φ = 15826944.

The previous prime is 40547821. The next prime is 40547861. The reversal of 40547840 is 4874504.

It is a tau number, because it is divible by the number of its divisors (80).

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 = 40547797 and 40547806.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120152 + ... + 120488.

Almost surely, 2^40547840 is an apocalyptic number.

40547840 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 40547840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49791456).

40547840 is an abundant number, since it is smaller than the sum of its proper divisors (59035072).

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

40547840 is an equidigital number, since it uses as much as digits as its factorization.

40547840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407 (or 391 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 40547840 is about 6367.7185867467. The cubic root of 40547840 is about 343.5494371630.

The spelling of 40547840 in words is "forty million, five hundred forty-seven thousand, eight hundred forty".