40728973 has 4 divisors (see below), whose sum is σ = 40979008. Its totient is φ = 40478940.

The previous prime is 40728967. The next prime is 40728979. The reversal of 40728973 is 37982704.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (40728967) and next prime (40728979).

It is a cyclic number.

It is not a de Polignac number, because 40728973 - 2²¹ = 38631821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40728979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124773 + ... + 125098.

It is an arithmetic number, because the mean of its divisors is an integer number (10244752).

Almost surely, 2^40728973 is an apocalyptic number.

It is an amenable number.

40728973 is a deficient number, since it is larger than the sum of its proper divisors (250035).

40728973 is a wasteful number, since it uses less digits than its factorization.

40728973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250034.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 40728973 is about 6381.9254931408. The cubic root of 40728973 is about 344.0602387973.

The spelling of 40728973 in words is "forty million, seven hundred twenty-eight thousand, nine hundred seventy-three".