39220409 has 2 divisors, whose sum is σ = 39220410. Its totient is φ = 39220408.

The previous prime is 39220399. The next prime is 39220439. The reversal of 39220409 is 90402293.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26296384 + 12924025 = 5128^2 + 3595^2 .

It is a cyclic number.

It is not a de Polignac number, because 39220409 - 2¹² = 39216313 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (39220439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19610204 + 19610205.

It is an arithmetic number, because the mean of its divisors is an integer number (19610205).

Almost surely, 2^39220409 is an apocalyptic number.

It is an amenable number.

39220409 is a deficient number, since it is larger than the sum of its proper divisors (1).

39220409 is an equidigital number, since it uses as much as digits as its factorization.

39220409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 39220409 is about 6262.6199788906. The cubic root of 39220409 is about 339.7587937427.

The spelling of 39220409 in words is "thirty-nine million, two hundred twenty thousand, four hundred nine".