40083991 has 2 divisors, whose sum is σ = 40083992. Its totient is φ = 40083990.

The previous prime is 40083983. The next prime is 40084001. The reversal of 40083991 is 19938004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40083991 - 2³ = 40083983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40083941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20041995 + 20041996.

It is an arithmetic number, because the mean of its divisors is an integer number (20041996).

Almost surely, 2^40083991 is an apocalyptic number.

40083991 is a deficient number, since it is larger than the sum of its proper divisors (1).

40083991 is an equidigital number, since it uses as much as digits as its factorization.

40083991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 40083991 is about 6331.1919099013. The cubic root of 40083991 is about 342.2343929717.

The spelling of 40083991 in words is "forty million, eighty-three thousand, nine hundred ninety-one".