1380559778 has 16 divisors (see below), whose sum is σ = 2231402040. Its totient is φ = 636819456.

The previous prime is 1380559769. The next prime is 1380559787. The reversal of 1380559778 is 8779550831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1380559769) and next prime (1380559787).

It can be written as a sum of positive squares in 4 ways, for example, as 1295496049 + 85063729 = 35993^2 + 9223^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34658 + ... + 62946.

Almost surely, 2^1380559778 is an apocalyptic number.

1380559778 is a deficient number, since it is larger than the sum of its proper divisors (850842262).

1380559778 is a wasteful number, since it uses less digits than its factorization.

1380559778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30181.

The product of its (nonzero) digits is 2116800, while the sum is 53.

The square root of 1380559778 is about 37155.8848367254. The cubic root of 1380559778 is about 1113.4867976825.

The spelling of 1380559778 in words is "one billion, three hundred eighty million, five hundred fifty-nine thousand, seven hundred seventy-eight".