1396938217 has 2 divisors, whose sum is σ = 1396938218. Its totient is φ = 1396938216.

The previous prime is 1396938211. The next prime is 1396938233. The reversal of 1396938217 is 7128396931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 760435776 + 636502441 = 27576^2 + 25229^2 .

It is a cyclic number.

It is not a de Polignac number, because 1396938217 - 2³ = 1396938209 is a prime.

It is not a weakly prime, because it can be changed into another prime (1396938211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698469108 + 698469109.

It is an arithmetic number, because the mean of its divisors is an integer number (698469109).

Almost surely, 2^1396938217 is an apocalyptic number.

It is an amenable number.

1396938217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1396938217 is an equidigital number, since it uses as much as digits as its factorization.

1396938217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 49.

The square root of 1396938217 is about 37375.6366768514. The cubic root of 1396938217 is about 1117.8728271367.

The spelling of 1396938217 in words is "one billion, three hundred ninety-six million, nine hundred thirty-eight thousand, two hundred seventeen".