40728191 has 16 divisors (see below), whose sum is σ = 49190400. Its totient is φ = 32941728.

The previous prime is 40728187. The next prime is 40728217. The reversal of 40728191 is 19182704.

It is a cyclic number.

It is not a de Polignac number, because 40728191 - 2² = 40728187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40728131) 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, 47321 + ... + 48173.

It is an arithmetic number, because the mean of its divisors is an integer number (3074400).

Almost surely, 2^40728191 is an apocalyptic number.

40728191 is a deficient number, since it is larger than the sum of its proper divisors (8462209).

40728191 is a wasteful number, since it uses less digits than its factorization.

40728191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 40728191 is about 6381.8642260706. The cubic root of 40728191 is about 344.0580367872.

The spelling of 40728191 in words is "forty million, seven hundred twenty-eight thousand, one hundred ninety-one".