1387745 has 4 divisors (see below), whose sum is σ = 1665300. Its totient is φ = 1110192.

The previous prime is 1387733. The next prime is 1387781. The reversal of 1387745 is 5477831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5477831 = 839 ⋅6529.

It can be written as a sum of positive squares in 2 ways, for example, as 369664 + 1018081 = 608^2 + 1009^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387745 - 2⁶ = 1387681 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138770 + ... + 138779.

It is an arithmetic number, because the mean of its divisors is an integer number (416325).

2^1387745 is an apocalyptic number.

It is an amenable number.

1387745 is a deficient number, since it is larger than the sum of its proper divisors (277555).

1387745 is an equidigital number, since it uses as much as digits as its factorization.

1387745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277554.

The product of its digits is 23520, while the sum is 35.

The square root of 1387745 is about 1178.0258910567. The cubic root of 1387745 is about 111.5415196576.

The spelling of 1387745 in words is "one million, three hundred eighty-seven thousand, seven hundred forty-five".