40578389 has 2 divisors, whose sum is σ = 40578390. Its totient is φ = 40578388.

The previous prime is 40578353. The next prime is 40578427. The reversal of 40578389 is 98387504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33988900 + 6589489 = 5830^2 + 2567^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40578389 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 (40578589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20289194 + 20289195.

It is an arithmetic number, because the mean of its divisors is an integer number (20289195).

Almost surely, 2^40578389 is an apocalyptic number.

It is an amenable number.

40578389 is a deficient number, since it is larger than the sum of its proper divisors (1).

40578389 is an equidigital number, since it uses as much as digits as its factorization.

40578389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 40578389 is about 6370.1168749090. The cubic root of 40578389 is about 343.6356929469.

The spelling of 40578389 in words is "forty million, five hundred seventy-eight thousand, three hundred eighty-nine".