1378783653 has 16 divisors (see below), whose sum is σ = 1980967296. Its totient is φ = 847978560.

The previous prime is 1378783649. The next prime is 1378783663. The reversal of 1378783653 is 3563878731.

It is not a de Polignac number, because 1378783653 - 2² = 1378783649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1378783596 and 1378783605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378783613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62463 + ... + 81603.

It is an arithmetic number, because the mean of its divisors is an integer number (123810456).

Almost surely, 2^1378783653 is an apocalyptic number.

1378783653 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1378783653 is a deficient number, since it is larger than the sum of its proper divisors (602183643).

1378783653 is a wasteful number, since it uses less digits than its factorization.

1378783653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21004.

The product of its digits is 2540160, while the sum is 51.

The square root of 1378783653 is about 37131.9761526370. The cubic root of 1378783653 is about 1113.0090831367.

The spelling of 1378783653 in words is "one billion, three hundred seventy-eight million, seven hundred eighty-three thousand, six hundred fifty-three".