1381240015 has 4 divisors (see below), whose sum is σ = 1657488024. Its totient is φ = 1104992008.

The previous prime is 1381240001. The next prime is 1381240057. The reversal of 1381240015 is 5100421831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5100421831 = 149 ⋅34231019.

It is a cyclic number.

It is not a de Polignac number, because 1381240015 - 2¹³ = 1381231823 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 138123997 + ... + 138124006.

It is an arithmetic number, because the mean of its divisors is an integer number (414372006).

Almost surely, 2^1381240015 is an apocalyptic number.

1381240015 is a deficient number, since it is larger than the sum of its proper divisors (276248009).

1381240015 is an equidigital number, since it uses as much as digits as its factorization.

1381240015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276248008.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 1381240015 is about 37165.0375352965. The cubic root of 1381240015 is about 1113.6696487652.

Adding to 1381240015 its reverse (5100421831), we get a palindrome (6481661846).

The spelling of 1381240015 in words is "one billion, three hundred eighty-one million, two hundred forty thousand, fifteen".