1397281726386 has 384 divisors, whose sum is σ = 3966775787520. Its totient is φ = 345171165696.

The previous prime is 1397281726339. The next prime is 1397281726409. The reversal of 1397281726386 is 6836271827931.

1397281726386 is a `hidden beast` number, since 1 + 3 + 97 + 281 + 7 + 263 + 8 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1845814320 + ... + 1845815076.

It is an arithmetic number, because the mean of its divisors is an integer number (10330145280).

Almost surely, 2^{1397281726386} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1397281726386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1983387893760).

1397281726386 is an abundant number, since it is smaller than the sum of its proper divisors (2569494061134).

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

1397281726386 is a wasteful number, since it uses less digits than its factorization.

1397281726386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398 (or 1395 counting only the distinct ones).

The product of its digits is 36578304, while the sum is 63.

The spelling of 1397281726386 in words is "one trillion, three hundred ninety-seven billion, two hundred eighty-one million, seven hundred twenty-six thousand, three hundred eighty-six".