1478357917 has 6 divisors (see below), whose sum is σ = 1480983902. Its totient is φ = 1475735352.

The previous prime is 1478357897. The next prime is 1478357939. The reversal of 1478357917 is 7197538741.

It can be written as a sum of positive squares in only one way, i.e., 1472947641 + 5410276 = 38379^2 + 2326^2 .

It is not a de Polignac number, because 1478357917 - 2¹⁹ = 1477833629 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 (1478357987) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1270578 + ... + 1271740.

Almost surely, 2^1478357917 is an apocalyptic number.

It is an amenable number.

1478357917 is a deficient number, since it is larger than the sum of its proper divisors (2625985).

1478357917 is an frugal number, since it uses more digits than its factorization.

1478357917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3419 (or 2256 counting only the distinct ones).

The product of its digits is 1481760, while the sum is 52.

The square root of 1478357917 is about 38449.4202427033. The cubic root of 1478357917 is about 1139.1822176979.

The spelling of 1478357917 in words is "one billion, four hundred seventy-eight million, three hundred fifty-seven thousand, nine hundred seventeen".