40665540 has 48 divisors (see below), whose sum is σ = 117794880. Its totient is φ = 10469760.

The previous prime is 40665523. The next prime is 40665551. The reversal of 40665540 is 4556604.

It is a super-2 number, since 2×40665540² = 3307372286983200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 40665498 and 40665507.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9946 + ... + 13425.

It is an arithmetic number, because the mean of its divisors is an integer number (2454060).

Almost surely, 2^40665540 is an apocalyptic number.

It is an amenable number.

40665540 is an abundant number, since it is smaller than the sum of its proper divisors (77129340).

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

40665540 is a wasteful number, since it uses less digits than its factorization.

40665540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23412 (or 23410 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 40665540 is about 6376.9538182427. The cubic root of 40665540 is about 343.8815280696.

The spelling of 40665540 in words is "forty million, six hundred sixty-five thousand, five hundred forty".