1252765305 has 32 divisors (see below), whose sum is σ = 2429608320. Its totient is φ = 607400640.

The previous prime is 1252765301. The next prime is 1252765313. The reversal of 1252765305 is 5035672521.

1252765305 is a `hidden beast` number, since 1 + 2 + 52 + 76 + 530 + 5 = 666.

It is not a de Polignac number, because 1252765305 - 2² = 1252765301 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1252765305.

It is not an unprimeable number, because it can be changed into a prime (1252765301) 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, 420322 + ... + 423291.

It is an arithmetic number, because the mean of its divisors is an integer number (75925260).

Almost surely, 2^1252765305 is an apocalyptic number.

1252765305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1252765305 is a deficient number, since it is larger than the sum of its proper divisors (1176843015).

1252765305 is a wasteful number, since it uses less digits than its factorization.

1252765305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843638 (or 843632 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 36.

The square root of 1252765305 is about 35394.4247728368. The cubic root of 1252765305 is about 1078.0111158345.

The spelling of 1252765305 in words is "one billion, two hundred fifty-two million, seven hundred sixty-five thousand, three hundred five".