40260991 has 2 divisors, whose sum is σ = 40260992. Its totient is φ = 40260990.

The previous prime is 40260967. The next prime is 40261009. The reversal of 40260991 is 19906204.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40260991 - 2⁵ = 40260959 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40260911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20130495 + 20130496.

It is an arithmetic number, because the mean of its divisors is an integer number (20130496).

Almost surely, 2^40260991 is an apocalyptic number.

40260991 is a deficient number, since it is larger than the sum of its proper divisors (1).

40260991 is an equidigital number, since it uses as much as digits as its factorization.

40260991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 40260991 is about 6345.1549232466. The cubic root of 40260991 is about 342.7373913218.

The spelling of 40260991 in words is "forty million, two hundred sixty thousand, nine hundred ninety-one".