40128373 has 4 divisors (see below), whose sum is σ = 41512140. Its totient is φ = 38744608.

The previous prime is 40128371. The next prime is 40128427. The reversal of 40128373 is 37382104.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12439729 + 27688644 = 3527^2 + 5262^2 .

It is a cyclic number.

It is not a de Polignac number, because 40128373 - 2¹ = 40128371 is a prime.

It is a super-2 number, since 2×40128373² = 3220572639254258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40128371) 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, 691840 + ... + 691897.

It is an arithmetic number, because the mean of its divisors is an integer number (10378035).

Almost surely, 2^40128373 is an apocalyptic number.

It is an amenable number.

40128373 is a deficient number, since it is larger than the sum of its proper divisors (1383767).

40128373 is a wasteful number, since it uses less digits than its factorization.

40128373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1383766.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 40128373 is about 6334.6959674478. The cubic root of 40128373 is about 342.3606565497.

The spelling of 40128373 in words is "forty million, one hundred twenty-eight thousand, three hundred seventy-three".