1265140290 has 32 divisors (see below), whose sum is σ = 3040085376. Its totient is φ = 336954240.

The previous prime is 1265140273. The next prime is 1265140301. The reversal of 1265140290 is 920415621.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 931 + ... + 50310.

It is an arithmetic number, because the mean of its divisors is an integer number (95002668).

Almost surely, 2^1265140290 is an apocalyptic number.

1265140290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1265140290 is an abundant number, since it is smaller than the sum of its proper divisors (1774945086).

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

1265140290 is a wasteful number, since it uses less digits than its factorization.

1265140290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52074.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1265140290 is about 35568.8106351618. The cubic root of 1265140290 is about 1081.5490716462.

The spelling of 1265140290 in words is "one billion, two hundred sixty-five million, one hundred forty thousand, two hundred ninety".