1265390478 has 64 divisors (see below), whose sum is σ = 3248087040. Its totient is φ = 360892800.

The previous prime is 1265390473. The next prime is 1265390501. The reversal of 1265390478 is 8740935621.

1265390478 is a `hidden beast` number, since 126 + 53 + 9 + 0 + 478 = 666.

1265390478 is digitally balanced in base 4 and base 10, because in such bases it contains all the possibile digits an equal number of times.

1265390478 is strictly pandigital in base 10.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265390473) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52558 + ... + 72753.

It is an arithmetic number, because the mean of its divisors is an integer number (50751360).

It is a 1-persistent number, because it is pandigital, but 2⋅1265390478 = 2530780956 is not.

Almost surely, 2^1265390478 is an apocalyptic number.

1265390478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1265390478 is an abundant number, since it is smaller than the sum of its proper divisors (1982696562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1265390478 is a wasteful number, since it uses less digits than its factorization.

1265390478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125350 (or 125344 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 1265390478 is about 35572.3274189362. The cubic root of 1265390478 is about 1081.6203609112.

The spelling of 1265390478 in words is "one billion, two hundred sixty-five million, three hundred ninety thousand, four hundred seventy-eight".