1387897845 has 16 divisors (see below), whose sum is σ = 2337512640. Its totient is φ = 701253504.

The previous prime is 1387897843. The next prime is 1387897859. The reversal of 1387897845 is 5487987831.

It is not a de Polignac number, because 1387897845 - 2¹ = 1387897843 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387897843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2434624 + ... + 2435193.

It is an arithmetic number, because the mean of its divisors is an integer number (146094540).

Almost surely, 2^1387897845 is an apocalyptic number.

1387897845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1387897845 is a deficient number, since it is larger than the sum of its proper divisors (949614795).

1387897845 is a wasteful number, since it uses less digits than its factorization.

1387897845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4869844.

The product of its digits is 13547520, while the sum is 60.

The square root of 1387897845 is about 37254.5010032345. The cubic root of 1387897845 is about 1115.4561453520.

The spelling of 1387897845 in words is "one billion, three hundred eighty-seven million, eight hundred ninety-seven thousand, eight hundred forty-five".