1251390012740 has 192 divisors, whose sum is σ = 3253535631360. Its totient is φ = 394503536640.

The previous prime is 1251390012739. The next prime is 1251390012773. The reversal of 1251390012740 is 472100931521.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 1251390012740.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 63638510 + ... + 63658170.

It is an arithmetic number, because the mean of its divisors is an integer number (16945498080).

Almost surely, 2^{1251390012740} is an apocalyptic number.

1251390012740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1251390012740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1626767815680).

1251390012740 is an abundant number, since it is smaller than the sum of its proper divisors (2002145618620).

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

1251390012740 is a wasteful number, since it uses less digits than its factorization.

1251390012740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20310 (or 20308 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 35.

The spelling of 1251390012740 in words is "one trillion, two hundred fifty-one billion, three hundred ninety million, twelve thousand, seven hundred forty".