40620389 has 2 divisors, whose sum is σ = 40620390. Its totient is φ = 40620388.

The previous prime is 40620383. The next prime is 40620407. The reversal of 40620389 is 98302604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35307364 + 5313025 = 5942^2 + 2305^2 .

It is a cyclic number.

It is not a de Polignac number, because 40620389 - 2⁴ = 40620373 is a prime.

It is a super-2 number, since 2×40620389² = 3300032005022642, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40620383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20310194 + 20310195.

It is an arithmetic number, because the mean of its divisors is an integer number (20310195).

Almost surely, 2^40620389 is an apocalyptic number.

It is an amenable number.

40620389 is a deficient number, since it is larger than the sum of its proper divisors (1).

40620389 is an equidigital number, since it uses as much as digits as its factorization.

40620389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 40620389 is about 6373.4126651269. The cubic root of 40620389 is about 343.7542102404.

The spelling of 40620389 in words is "forty million, six hundred twenty thousand, three hundred eighty-nine".