1276400251389 has 8 divisors (see below), whose sum is σ = 1702323648640. Its totient is φ = 850705177536.

The previous prime is 1276400251387. The next prime is 1276400251391. The reversal of 1276400251389 is 9831520046721.

It is an interprime number because it is at equal distance from previous prime (1276400251387) and next prime (1276400251391).

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

It is not a de Polignac number, because 1276400251389 - 2¹ = 1276400251387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1276400251387) 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, 57067804 + ... + 57090165.

It is an arithmetic number, because the mean of its divisors is an integer number (212790456080).

It is a 1-persistent number, because it is pandigital, but 2⋅1276400251389 = 2552800502778 is not.

Almost surely, 2^{1276400251389} is an apocalyptic number.

It is an amenable number.

1276400251389 is a deficient number, since it is larger than the sum of its proper divisors (425923397251).

1276400251389 is a wasteful number, since it uses less digits than its factorization.

1276400251389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114161699.

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 1276400251389 in words is "one trillion, two hundred seventy-six billion, four hundred million, two hundred fifty-one thousand, three hundred eighty-nine".