40405724 has 12 divisors (see below), whose sum is σ = 72354744. Its totient is φ = 19732944.

The previous prime is 40405711. The next prime is 40405747. The reversal of 40405724 is 42750404.

It is a junction number, because it is equal to n+sod(n) for n = 40405693 and 40405702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117287 + ... + 117630.

It is an arithmetic number, because the mean of its divisors is an integer number (6029562).

Almost surely, 2^40405724 is an apocalyptic number.

It is an amenable number.

40405724 is a deficient number, since it is larger than the sum of its proper divisors (31949020).

40405724 is a wasteful number, since it uses less digits than its factorization.

40405724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234964 (or 234962 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 26.

The square root of 40405724 is about 6356.5496930332. The cubic root of 40405724 is about 343.1475988734.

The spelling of 40405724 in words is "forty million, four hundred five thousand, seven hundred twenty-four".