40072789 has 2 divisors, whose sum is σ = 40072790. Its totient is φ = 40072788.

The previous prime is 40072787. The next prime is 40072793. The reversal of 40072789 is 98727004.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32970564 + 7102225 = 5742^2 + 2665^2 .

It is a cyclic number.

It is not a de Polignac number, because 40072789 - 2¹ = 40072787 is a prime.

Together with 40072787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40072787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20036394 + 20036395.

It is an arithmetic number, because the mean of its divisors is an integer number (20036395).

Almost surely, 2^40072789 is an apocalyptic number.

It is an amenable number.

40072789 is a deficient number, since it is larger than the sum of its proper divisors (1).

40072789 is an equidigital number, since it uses as much as digits as its factorization.

40072789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 40072789 is about 6330.3071805403. The cubic root of 40072789 is about 342.2025093630.

The spelling of 40072789 in words is "forty million, seventy-two thousand, seven hundred eighty-nine".