1265500842 has 32 divisors (see below), whose sum is σ = 2713824000. Its totient is φ = 391991808.

The previous prime is 1265500829. The next prime is 1265500889. The reversal of 1265500842 is 2480055621.

It is a super-2 number, since 2×1265500842² = 3202984762205417928, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70467 + ... + 86582.

It is an arithmetic number, because the mean of its divisors is an integer number (84807000).

Almost surely, 2^1265500842 is an apocalyptic number.

1265500842 is an abundant number, since it is smaller than the sum of its proper divisors (1448323158).

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

1265500842 is a wasteful number, since it uses less digits than its factorization.

1265500842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157150.

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 1265500842 is about 35573.8786471197. The cubic root of 1265500842 is about 1081.6518053497.

The spelling of 1265500842 in words is "one billion, two hundred sixty-five million, five hundred thousand, eight hundred forty-two".