1389980615 has 4 divisors (see below), whose sum is σ = 1667976744. Its totient is φ = 1111984488.

The previous prime is 1389980563. The next prime is 1389980617. The reversal of 1389980615 is 5160899831.

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: 5160899831 = 17 ⋅303582343.

It is a cyclic number.

It is not a de Polignac number, because 1389980615 - 2¹⁸ = 1389718471 is a prime.

It is a super-2 number, since 2×1389980615² = 3864092220151556450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389980617) 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, 138998057 + ... + 138998066.

It is an arithmetic number, because the mean of its divisors is an integer number (416994186).

Almost surely, 2^1389980615 is an apocalyptic number.

1389980615 is a deficient number, since it is larger than the sum of its proper divisors (277996129).

1389980615 is an equidigital number, since it uses as much as digits as its factorization.

1389980615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277996128.

The product of its (nonzero) digits is 466560, while the sum is 50.

The square root of 1389980615 is about 37282.4437906101. The cubic root of 1389980615 is about 1116.0138418803.

The spelling of 1389980615 in words is "one billion, three hundred eighty-nine million, nine hundred eighty thousand, six hundred fifteen".