1478990657 has 2 divisors, whose sum is σ = 1478990658. Its totient is φ = 1478990656.

The previous prime is 1478990627. The next prime is 1478990717. The reversal of 1478990657 is 7560998741.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1445824576 + 33166081 = 38024^2 + 5759^2 .

It is a cyclic number.

It is not a de Polignac number, because 1478990657 - 2¹⁶ = 1478925121 is a prime.

It is not a weakly prime, because it can be changed into another prime (1478990627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 739495328 + 739495329.

It is an arithmetic number, because the mean of its divisors is an integer number (739495329).

Almost surely, 2^1478990657 is an apocalyptic number.

It is an amenable number.

1478990657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1478990657 is an equidigital number, since it uses as much as digits as its factorization.

1478990657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3810240, while the sum is 56.

The square root of 1478990657 is about 38457.6475749623. The cubic root of 1478990657 is about 1139.3447185685.

The spelling of 1478990657 in words is "one billion, four hundred seventy-eight million, nine hundred ninety thousand, six hundred fifty-seven".