1578947387 has 2 divisors, whose sum is σ = 1578947388. Its totient is φ = 1578947386.

The previous prime is 1578947347. The next prime is 1578947423. The reversal of 1578947387 is 7837498751.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1578947387 - 2¹⁰ = 1578946363 is a prime.

It is not a weakly prime, because it can be changed into another prime (1578947347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 789473693 + 789473694.

It is an arithmetic number, because the mean of its divisors is an integer number (789473694).

Almost surely, 2^1578947387 is an apocalyptic number.

1578947387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1578947387 is an equidigital number, since it uses as much as digits as its factorization.

1578947387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11854080, while the sum is 59.

The square root of 1578947387 is about 39735.9709457313. The cubic root of 1578947387 is about 1164.4545788785.

The spelling of 1578947387 in words is "one billion, five hundred seventy-eight million, nine hundred forty-seven thousand, three hundred eighty-seven".