1377206245 has 4 divisors (see below), whose sum is σ = 1652647500. Its totient is φ = 1101764992.

The previous prime is 1377206231. The next prime is 1377206249. The reversal of 1377206245 is 5426027731.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5426027731 = 73 ⋅74329147.

It can be written as a sum of positive squares in 2 ways, for example, as 970820964 + 406385281 = 31158^2 + 20159^2 .

It is a cyclic number.

It is not a de Polignac number, because 1377206245 - 2²¹ = 1375109093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377206249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137720620 + ... + 137720629.

It is an arithmetic number, because the mean of its divisors is an integer number (413161875).

Almost surely, 2^1377206245 is an apocalyptic number.

It is an amenable number.

1377206245 is a deficient number, since it is larger than the sum of its proper divisors (275441255).

1377206245 is an equidigital number, since it uses as much as digits as its factorization.

1377206245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275441254.

The product of its (nonzero) digits is 70560, while the sum is 37.

The square root of 1377206245 is about 37110.7295131745. The cubic root of 1377206245 is about 1112.5844723133.

The spelling of 1377206245 in words is "one billion, three hundred seventy-seven million, two hundred six thousand, two hundred forty-five".