1265002890 has 16 divisors (see below), whose sum is σ = 3036007008. Its totient is φ = 337334096.

The previous prime is 1265002883. The next prime is 1265002927. The reversal of 1265002890 is 982005621.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21083352 + ... + 21083411.

It is an arithmetic number, because the mean of its divisors is an integer number (189750438).

Almost surely, 2^1265002890 is an apocalyptic number.

1265002890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1265002890 is an abundant number, since it is smaller than the sum of its proper divisors (1771004118).

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

1265002890 is a wasteful number, since it uses less digits than its factorization.

1265002890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42166773.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 1265002890 is about 35566.8791152668. The cubic root of 1265002890 is about 1081.5099165096.

The spelling of 1265002890 in words is "one billion, two hundred sixty-five million, two thousand, eight hundred ninety".