1378694772 has 216 divisors, whose sum is σ = 4444221600. Its totient is φ = 357098112.

The previous prime is 1378694753. The next prime is 1378694789. The reversal of 1378694772 is 2774968731.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1352479 + ... + 1353497.

It is an arithmetic number, because the mean of its divisors is an integer number (20575100).

Almost surely, 2^1378694772 is an apocalyptic number.

1378694772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1378694772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2222110800).

1378694772 is an abundant number, since it is smaller than the sum of its proper divisors (3065526828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1378694772 is a wasteful number, since it uses less digits than its factorization.

1378694772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115 (or 1103 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 54.

The square root of 1378694772 is about 37130.7793077387. The cubic root of 1378694772 is about 1112.9851665283.

It can be divided in two parts, 13 and 78694772, that added together give a triangular number (78694785 = T₁₂₅₄₅).

The spelling of 1378694772 in words is "one billion, three hundred seventy-eight million, six hundred ninety-four thousand, seven hundred seventy-two".