1387479745 has 4 divisors (see below), whose sum is σ = 1664975700. Its totient is φ = 1109983792.

The previous prime is 1387479733. The next prime is 1387479749. The reversal of 1387479745 is 5479747831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5479747831 = 367 ⋅14931193.

It can be written as a sum of positive squares in 2 ways, for example, as 358609969 + 1028869776 = 18937^2 + 32076^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387479745 - 2¹⁹ = 1386955457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1387479749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138747970 + ... + 138747979.

It is an arithmetic number, because the mean of its divisors is an integer number (416243925).

Almost surely, 2^1387479745 is an apocalyptic number.

It is an amenable number.

1387479745 is a deficient number, since it is larger than the sum of its proper divisors (277495955).

1387479745 is an equidigital number, since it uses as much as digits as its factorization.

1387479745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277495954.

The product of its digits is 5927040, while the sum is 55.

The square root of 1387479745 is about 37248.8891780681. The cubic root of 1387479745 is about 1115.3441248468.

The spelling of 1387479745 in words is "one billion, three hundred eighty-seven million, four hundred seventy-nine thousand, seven hundred forty-five".