40728999 has 4 divisors (see below), whose sum is σ = 54305336. Its totient is φ = 27152664.

The previous prime is 40728979. The next prime is 40729033. The reversal of 40728999 is 99982704.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 40728999 - 2⁵ = 40728967 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 (40728959) 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, 6788164 + ... + 6788169.

It is an arithmetic number, because the mean of its divisors is an integer number (13576334).

Almost surely, 2^40728999 is an apocalyptic number.

40728999 is a deficient number, since it is larger than the sum of its proper divisors (13576337).

40728999 is a wasteful number, since it uses less digits than its factorization.

40728999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13576336.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 40728999 is about 6381.9275301432. The cubic root of 40728999 is about 344.0603120094.

The spelling of 40728999 in words is "forty million, seven hundred twenty-eight thousand, nine hundred ninety-nine".