40529781 has 16 divisors (see below), whose sum is σ = 60609600. Its totient is φ = 26765424.

The previous prime is 40529777. The next prime is 40529821. The reversal of 40529781 is 18792504.

It is not a de Polignac number, because 40529781 - 2² = 40529777 is a prime.

It is a super-2 number, since 2×40529781² = 3285326295815922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40529081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4126 + ... + 9903.

It is an arithmetic number, because the mean of its divisors is an integer number (3788100).

Almost surely, 2^40529781 is an apocalyptic number.

It is an amenable number.

40529781 is a deficient number, since it is larger than the sum of its proper divisors (20079819).

40529781 is a wasteful number, since it uses less digits than its factorization.

40529781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14145 (or 14139 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 40529781 is about 6366.3004170397. The cubic root of 40529781 is about 343.4984267963.

The spelling of 40529781 in words is "forty million, five hundred twenty-nine thousand, seven hundred eighty-one".