1265729490 has 80 divisors (see below), whose sum is σ = 3410042328. Its totient is φ = 336870144.

The previous prime is 1265729483. The next prime is 1265729501. The reversal of 1265729490 is 949275621.

It can be written as a sum of positive squares in 4 ways, for example, as 458430921 + 807298569 = 21411^2 + 28413^2 .

It is a super-2 number, since 2×1265729490² = 3204142283711320200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 527734 + ... + 530126.

Almost surely, 2^1265729490 is an apocalyptic number.

1265729490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1265729490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1705021164).

1265729490 is an abundant number, since it is smaller than the sum of its proper divisors (2144312838).

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

1265729490 is a wasteful number, since it uses less digits than its factorization.

1265729490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3065 (or 3056 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 1265729490 is about 35577.0922083298. The cubic root of 1265729490 is about 1081.7169449425.

The spelling of 1265729490 in words is "one billion, two hundred sixty-five million, seven hundred twenty-nine thousand, four hundred ninety".