1397881798 has 8 divisors (see below), whose sum is σ = 2147964840. Its totient is φ = 681893520.

The previous prime is 1397881783. The next prime is 1397881817. The reversal of 1397881798 is 8971887931.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8523588 + ... + 8523751.

It is an arithmetic number, because the mean of its divisors is an integer number (268495605).

Almost surely, 2^1397881798 is an apocalyptic number.

1397881798 is a deficient number, since it is larger than the sum of its proper divisors (750083042).

1397881798 is a wasteful number, since it uses less digits than its factorization.

1397881798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17047382.

The product of its digits is 6096384, while the sum is 61.

The square root of 1397881798 is about 37388.2574881473. The cubic root of 1397881798 is about 1118.1244646447.

The spelling of 1397881798 in words is "one billion, three hundred ninety-seven million, eight hundred eighty-one thousand, seven hundred ninety-eight".