1378073557 has 16 divisors (see below), whose sum is σ = 1589015680. Its totient is φ = 1170692352.

The previous prime is 1378073537. The next prime is 1378073563. The reversal of 1378073557 is 7553708731.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1378073557 - 2⁷ = 1378073429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378073527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 465193 + ... + 468145.

It is an arithmetic number, because the mean of its divisors is an integer number (99313480).

Almost surely, 2^1378073557 is an apocalyptic number.

It is an amenable number.

1378073557 is a deficient number, since it is larger than the sum of its proper divisors (210942123).

1378073557 is a wasteful number, since it uses less digits than its factorization.

1378073557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3532.

The product of its (nonzero) digits is 617400, while the sum is 46.

The square root of 1378073557 is about 37122.4131354631. The cubic root of 1378073557 is about 1112.8179777338.

It can be divided in two parts, 1378073 and 557, that added together give a triangular number (1378630 = T₁₆₆₀).

The spelling of 1378073557 in words is "one billion, three hundred seventy-eight million, seventy-three thousand, five hundred fifty-seven".