1378926081 has 12 divisors (see below), whose sum is σ = 2144996308. Its totient is φ = 848569824.

The previous prime is 1378926079. The next prime is 1378926089. The reversal of 1378926081 is 1806298731.

1378926081 is a `hidden beast` number, since 1 + 37 + 8 + 9 + 2 + 608 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 55130625 + 1323795456 = 7425^2 + 36384^2 .

It is not a de Polignac number, because 1378926081 - 2¹ = 1378926079 is a prime.

It is a super-2 number, since 2×1378926081² = 3802874273724037122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1378926089) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5892730 + ... + 5892963.

Almost surely, 2^1378926081 is an apocalyptic number.

It is an amenable number.

1378926081 is a deficient number, since it is larger than the sum of its proper divisors (766070227).

1378926081 is a wasteful number, since it uses less digits than its factorization.

1378926081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11785712 (or 11785709 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 1378926081 is about 37133.8939649480. The cubic root of 1378926081 is about 1113.0474063354.

The spelling of 1378926081 in words is "one billion, three hundred seventy-eight million, nine hundred twenty-six thousand, eighty-one".