1254135440 has 20 divisors (see below), whose sum is σ = 2915865084. Its totient is φ = 501654144.

The previous prime is 1254135439. The next prime is 1254135457. The reversal of 1254135440 is 445314521.

It can be written as a sum of positive squares in 2 ways, for example, as 479960464 + 774174976 = 21908^2 + 27824^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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 3 ways as a sum of consecutive naturals, for example, 7838267 + ... + 7838426.

Almost surely, 2^1254135440 is an apocalyptic number.

1254135440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1254135440 is an abundant number, since it is smaller than the sum of its proper divisors (1661729644).

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

1254135440 is a wasteful number, since it uses less digits than its factorization.

1254135440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15676706 (or 15676700 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 1254135440 is about 35413.7747211449. The cubic root of 1254135440 is about 1078.4039754320.

Adding to 1254135440 its reverse (445314521), we get a palindrome (1699449961).

The spelling of 1254135440 in words is "one billion, two hundred fifty-four million, one hundred thirty-five thousand, four hundred forty".