40311989 has 2 divisors, whose sum is σ = 40311990. Its totient is φ = 40311988.

The previous prime is 40311983. The next prime is 40311991. The reversal of 40311989 is 98911304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38031889 + 2280100 = 6167^2 + 1510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40311989 is a prime.

It is a super-2 number, since 2×40311989² = 3250112914272242, which contains 22 as substring.

Together with 40311991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40311983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20155994 + 20155995.

It is an arithmetic number, because the mean of its divisors is an integer number (20155995).

Almost surely, 2^40311989 is an apocalyptic number.

It is an amenable number.

40311989 is a deficient number, since it is larger than the sum of its proper divisors (1).

40311989 is an equidigital number, since it uses as much as digits as its factorization.

40311989 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 35.

The square root of 40311989 is about 6349.1723082619. The cubic root of 40311989 is about 342.8820437189.

The spelling of 40311989 in words is "forty million, three hundred eleven thousand, nine hundred eighty-nine".