1276400251393 has 8 divisors (see below), whose sum is σ = 1351548757800. Its totient is φ = 1201259093760.

The previous prime is 1276400251391. The next prime is 1276400251433. The reversal of 1276400251393 is 3931520046721.

It can be written as a sum of positive squares in 4 ways, for example, as 489184139889 + 787216111504 = 699417^2 + 887252^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1276400251393 - 2¹ = 1276400251391 is a prime.

It is a super-2 number, since 2×1276400251393² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1276400251391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1477578 + ... + 2176243.

It is an arithmetic number, because the mean of its divisors is an integer number (168943594725).

Almost surely, 2^{1276400251393} is an apocalyptic number.

It is an amenable number.

1276400251393 is a deficient number, since it is larger than the sum of its proper divisors (75148506407).

1276400251393 is a wasteful number, since it uses less digits than its factorization.

1276400251393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3674387.

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 1276400251393 in words is "one trillion, two hundred seventy-six billion, four hundred million, two hundred fifty-one thousand, three hundred ninety-three".