1254126640 has 40 divisors (see below), whose sum is σ = 3140142768. Its totient is φ = 463061760.

The previous prime is 1254126631. The next prime is 1254126667. The reversal of 1254126640 is 466214521.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

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 7 ways as a sum of consecutive naturals, for example, 601906 + ... + 603985.

Almost surely, 2^1254126640 is an apocalyptic number.

1254126640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1254126640 is an abundant number, since it is smaller than the sum of its proper divisors (1886016128).

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

1254126640 is a wasteful number, since it uses less digits than its factorization.

1254126640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205917 (or 1205911 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 1254126640 is about 35413.6504754876. The cubic root of 1254126640 is about 1078.4014531161.

The spelling of 1254126640 in words is "one billion, two hundred fifty-four million, one hundred twenty-six thousand, six hundred forty".