1379378578 has 4 divisors (see below), whose sum is σ = 2069067870. Its totient is φ = 689689288.

The previous prime is 1379378519. The next prime is 1379378579. The reversal of 1379378578 is 8758739731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1371443089 + 7935489 = 37033^2 + 2817^2 .

It is a super-2 number, since 2×1379378578² = 3805370522890604168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1379378579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344844643 + ... + 344844646.

Almost surely, 2^1379378578 is an apocalyptic number.

1379378578 is a deficient number, since it is larger than the sum of its proper divisors (689689292).

1379378578 is an equidigital number, since it uses as much as digits as its factorization.

1379378578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689689291.

The product of its digits is 8890560, while the sum is 58.

The square root of 1379378578 is about 37139.9862412468. The cubic root of 1379378578 is about 1113.1691425033.

The spelling of 1379378578 in words is "one billion, three hundred seventy-nine million, three hundred seventy-eight thousand, five hundred seventy-eight".