40352781 has 48 divisors (see below), whose sum is σ = 66999680. Its totient is φ = 21150720.

The previous prime is 40352773. The next prime is 40352783. The reversal of 40352781 is 18725304.

It is not a de Polignac number, because 40352781 - 2³ = 40352773 is a prime.

It is a super-2 number, since 2×40352781² = 3256693868867922, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40352783) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 370155 + ... + 370263.

Almost surely, 2^40352781 is an apocalyptic number.

It is an amenable number.

40352781 is a deficient number, since it is larger than the sum of its proper divisors (26646899).

40352781 is a wasteful number, since it uses less digits than its factorization.

40352781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 40352781 is about 6352.3838832363. The cubic root of 40352781 is about 342.9976596893.

The spelling of 40352781 in words is "forty million, three hundred fifty-two thousand, seven hundred eighty-one".