1378961573 has 8 divisors (see below), whose sum is σ = 1569727296. Its totient is φ = 1199096800.

The previous prime is 1378961533. The next prime is 1378961609. The reversal of 1378961573 is 3751698731.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1378961573 - 2⁶ = 1378961509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378961533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2724968 + ... + 2725473.

It is an arithmetic number, because the mean of its divisors is an integer number (196215912).

Almost surely, 2^1378961573 is an apocalyptic number.

It is an amenable number.

1378961573 is a deficient number, since it is larger than the sum of its proper divisors (190765723).

1378961573 is a wasteful number, since it uses less digits than its factorization.

1378961573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5450475.

The product of its digits is 952560, while the sum is 50.

The square root of 1378961573 is about 37134.3718541192. The cubic root of 1378961573 is about 1113.0569557812.

The spelling of 1378961573 in words is "one billion, three hundred seventy-eight million, nine hundred sixty-one thousand, five hundred seventy-three".