40028993 has 16 divisors (see below), whose sum is σ = 43021056. Its totient is φ = 37160640.

The previous prime is 40028987. The next prime is 40029013. The reversal of 40028993 is 39982004.

It is not a de Polignac number, because 40028993 - 2⁴ = 40028977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40028983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144371 + ... + 144647.

It is an arithmetic number, because the mean of its divisors is an integer number (2688816).

Almost surely, 2^40028993 is an apocalyptic number.

It is an amenable number.

40028993 is a deficient number, since it is larger than the sum of its proper divisors (2992063).

40028993 is a wasteful number, since it uses less digits than its factorization.

40028993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 40028993 is about 6326.8470030498. The cubic root of 40028993 is about 342.0777982673.

The spelling of 40028993 in words is "forty million, twenty-eight thousand, nine hundred ninety-three".