1397901726 has 96 divisors (see below), whose sum is σ = 3418947168. Its totient is φ = 425502720.

The previous prime is 1397901719. The next prime is 1397901727. The reversal of 1397901726 is 6271097931.

1397901726 is a `hidden beast` number, since 1 + 397 + 90 + 172 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397901727) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 611706 + ... + 613986.

It is an arithmetic number, because the mean of its divisors is an integer number (35614033).

Almost surely, 2^1397901726 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1397901726, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1709473584).

1397901726 is an abundant number, since it is smaller than the sum of its proper divisors (2021045442).

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

1397901726 is a wasteful number, since it uses less digits than its factorization.

1397901726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2408 (or 2396 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The square root of 1397901726 is about 37388.5239879833. The cubic root of 1397901726 is about 1118.1297778928.

The spelling of 1397901726 in words is "one billion, three hundred ninety-seven million, nine hundred one thousand, seven hundred twenty-six".