1381790826 has 192 divisors, whose sum is σ = 3597205248. Its totient is φ = 394149888.

The previous prime is 1381790779. The next prime is 1381790881. The reversal of 1381790826 is 6280971831.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5376490 + ... + 5376746.

It is an arithmetic number, because the mean of its divisors is an integer number (18735444).

Almost surely, 2^1381790826 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1381790826, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1798602624).

1381790826 is an abundant number, since it is smaller than the sum of its proper divisors (2215414422).

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

1381790826 is a wasteful number, since it uses less digits than its factorization.

1381790826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 1381790826 is about 37172.4471349412. The cubic root of 1381790826 is about 1113.8176655145.

The spelling of 1381790826 in words is "one billion, three hundred eighty-one million, seven hundred ninety thousand, eight hundred twenty-six".