1265390473 has 2 divisors, whose sum is σ = 1265390474. Its totient is φ = 1265390472.

The previous prime is 1265390459. The next prime is 1265390501. The reversal of 1265390473 is 3740935621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1044065344 + 221325129 = 32312^2 + 14877^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265390473 - 2¹³ = 1265382281 is a prime.

It is not a weakly prime, because it can be changed into another prime (1265390173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632695236 + 632695237.

It is an arithmetic number, because the mean of its divisors is an integer number (632695237).

Almost surely, 2^1265390473 is an apocalyptic number.

It is an amenable number.

1265390473 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265390473 is an equidigital number, since it uses as much as digits as its factorization.

1265390473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 136080, while the sum is 40.

The square root of 1265390473 is about 35572.3273486568. The cubic root of 1265390473 is about 1081.6203594866.

The spelling of 1265390473 in words is "one billion, two hundred sixty-five million, three hundred ninety thousand, four hundred seventy-three".