40721787 has 12 divisors (see below), whose sum is σ = 60072480. Its totient is φ = 26569968.

The previous prime is 40721777. The next prime is 40721789. The reversal of 40721787 is 78712704.

It is not a de Polignac number, because 40721787 - 2⁸ = 40721531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40721789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 47712 + ... + 48557.

It is an arithmetic number, because the mean of its divisors is an integer number (5006040).

Almost surely, 2^40721787 is an apocalyptic number.

40721787 is a gapful number since it is divisible by the number (47) formed by its first and last digit.

40721787 is a deficient number, since it is larger than the sum of its proper divisors (19350693).

40721787 is a wasteful number, since it uses less digits than its factorization.

40721787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96322 (or 96319 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 36.

The square root of 40721787 is about 6381.3624720744. The cubic root of 40721787 is about 344.0400028971.

The spelling of 40721787 in words is "forty million, seven hundred twenty-one thousand, seven hundred eighty-seven".