1265421140 has 12 divisors (see below), whose sum is σ = 2657384436. Its totient is φ = 506168448.

The previous prime is 1265421103. The next prime is 1265421169. The reversal of 1265421140 is 411245621.

It can be written as a sum of positive squares in 2 ways, for example, as 700978576 + 564442564 = 26476^2 + 23758^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31635509 + ... + 31635548.

It is an arithmetic number, because the mean of its divisors is an integer number (221448703).

Almost surely, 2^1265421140 is an apocalyptic number.

1265421140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1265421140 is an abundant number, since it is smaller than the sum of its proper divisors (1391963296).

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

1265421140 is a wasteful number, since it uses less digits than its factorization.

1265421140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63271066 (or 63271064 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 1265421140 is about 35572.7583974029. The cubic root of 1265421140 is about 1081.6290971804.

Adding to 1265421140 its reverse (411245621), we get a palindrome (1676666761).

The spelling of 1265421140 in words is "one billion, two hundred sixty-five million, four hundred twenty-one thousand, one hundred forty".