40538881 has 2 divisors, whose sum is σ = 40538882. Its totient is φ = 40538880.

The previous prime is 40538833. The next prime is 40538899. The reversal of 40538881 is 18883504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35808256 + 4730625 = 5984^2 + 2175^2 .

It is a cyclic number.

It is not a de Polignac number, because 40538881 - 2²¹ = 38441729 is a prime.

It is a super-2 number, since 2×40538881² = 3286801745464322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40538881.

It is not a weakly prime, because it can be changed into another prime (40538801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20269440 + 20269441.

It is an arithmetic number, because the mean of its divisors is an integer number (20269441).

Almost surely, 2^40538881 is an apocalyptic number.

It is an amenable number.

40538881 is a deficient number, since it is larger than the sum of its proper divisors (1).

40538881 is an equidigital number, since it uses as much as digits as its factorization.

40538881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 40538881 is about 6367.0150777268. The cubic root of 40538881 is about 343.5241330111.

The spelling of 40538881 in words is "forty million, five hundred thirty-eight thousand, eight hundred eighty-one".