40197881 has 2 divisors, whose sum is σ = 40197882. Its totient is φ = 40197880.

The previous prime is 40197811. The next prime is 40197887. The reversal of 40197881 is 18879104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37100281 + 3097600 = 6091^2 + 1760^2 .

It is a cyclic number.

It is not a de Polignac number, because 40197881 - 2²² = 36003577 is a prime.

It is a super-2 number, since 2×40197881² = 3231739273780322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40197887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20098940 + 20098941.

It is an arithmetic number, because the mean of its divisors is an integer number (20098941).

Almost surely, 2^40197881 is an apocalyptic number.

It is an amenable number.

40197881 is a deficient number, since it is larger than the sum of its proper divisors (1).

40197881 is an equidigital number, since it uses as much as digits as its factorization.

40197881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 40197881 is about 6340.1798870379. The cubic root of 40197881 is about 342.5582148369.

The spelling of 40197881 in words is "forty million, one hundred ninety-seven thousand, eight hundred eighty-one".