1398105861 has 8 divisors (see below), whose sum is σ = 1962253920. Its totient is φ = 883014192.

The previous prime is 1398105847. The next prime is 1398105869. The reversal of 1398105861 is 1685018931.

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

It is not a de Polignac number, because 1398105861 - 2⁷ = 1398105733 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398105869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12264030 + ... + 12264143.

It is an arithmetic number, because the mean of its divisors is an integer number (245281740).

Almost surely, 2^1398105861 is an apocalyptic number.

It is an amenable number.

1398105861 is a deficient number, since it is larger than the sum of its proper divisors (564148059).

1398105861 is a wasteful number, since it uses less digits than its factorization.

1398105861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24528195.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 1398105861 is about 37391.2538035300. The cubic root of 1398105861 is about 1118.1842019172.

The spelling of 1398105861 in words is "one billion, three hundred ninety-eight million, one hundred five thousand, eight hundred sixty-one".