1378836479 has 4 divisors (see below), whose sum is σ = 1451406840. Its totient is φ = 1306266120.

The previous prime is 1378836457. The next prime is 1378836491. The reversal of 1378836479 is 9746388731.

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

It is a cyclic number.

It is not a de Polignac number, because 1378836479 - 2¹² = 1378832383 is a prime.

It is a super-2 number, since 2×1378836479² = 3802380071642234882, 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 (1378836419) 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, 36285152 + ... + 36285189.

It is an arithmetic number, because the mean of its divisors is an integer number (362851710).

Almost surely, 2^1378836479 is an apocalyptic number.

1378836479 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1378836479 is a deficient number, since it is larger than the sum of its proper divisors (72570361).

1378836479 is an equidigital number, since it uses as much as digits as its factorization.

1378836479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72570360.

The product of its digits is 6096384, while the sum is 56.

The square root of 1378836479 is about 37132.6874734377. The cubic root of 1378836479 is about 1113.0232973723.

The spelling of 1378836479 in words is "one billion, three hundred seventy-eight million, eight hundred thirty-six thousand, four hundred seventy-nine".