40528091 has 4 divisors (see below), whose sum is σ = 40819800. Its totient is φ = 40236384.

The previous prime is 40528079. The next prime is 40528097. The reversal of 40528091 is 19082504.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40528091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40528097) 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, 145646 + ... + 145923.

It is an arithmetic number, because the mean of its divisors is an integer number (10204950).

Almost surely, 2^40528091 is an apocalyptic number.

40528091 is a deficient number, since it is larger than the sum of its proper divisors (291709).

40528091 is a wasteful number, since it uses less digits than its factorization.

40528091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291708.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 40528091 is about 6366.1676855075. The cubic root of 40528091 is about 343.4936523613.

The spelling of 40528091 in words is "forty million, five hundred twenty-eight thousand, ninety-one".