39677221 has 2 divisors, whose sum is σ = 39677222. Its totient is φ = 39677220.

The previous prime is 39677207. The next prime is 39677243. The reversal of 39677221 is 12277693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30129121 + 9548100 = 5489^2 + 3090^2 .

It is a cyclic number.

It is not a de Polignac number, because 39677221 - 2⁵ = 39677189 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 (39677291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19838610 + 19838611.

It is an arithmetic number, because the mean of its divisors is an integer number (19838611).

Almost surely, 2^39677221 is an apocalyptic number.

It is an amenable number.

39677221 is a deficient number, since it is larger than the sum of its proper divisors (1).

39677221 is an equidigital number, since it uses as much as digits as its factorization.

39677221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 37.

The square root of 39677221 is about 6298.9857120016. The cubic root of 39677221 is about 341.0727965830.

The spelling of 39677221 in words is "thirty-nine million, six hundred seventy-seven thousand, two hundred twenty-one".