1377228397 has 2 divisors, whose sum is σ = 1377228398. Its totient is φ = 1377228396.

The previous prime is 1377228383. The next prime is 1377228401. The reversal of 1377228397 is 7938227731.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1292330601 + 84897796 = 35949^2 + 9214^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377228397 - 2⁷ = 1377228269 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1377228397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1377228997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 688614198 + 688614199.

It is an arithmetic number, because the mean of its divisors is an integer number (688614199).

Almost surely, 2^1377228397 is an apocalyptic number.

It is an amenable number.

1377228397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1377228397 is an equidigital number, since it uses as much as digits as its factorization.

1377228397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 889056, while the sum is 49.

The square root of 1377228397 is about 37111.0279701331. The cubic root of 1377228397 is about 1112.5904374908.

The spelling of 1377228397 in words is "one billion, three hundred seventy-seven million, two hundred twenty-eight thousand, three hundred ninety-seven".