1398080861 has 4 divisors (see below), whose sum is σ = 1410453372. Its totient is φ = 1385708352.

The previous prime is 1398080843. The next prime is 1398080881. The reversal of 1398080861 is 1680808931.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 391287961 + 1006792900 = 19781^2 + 31730^2 .

It is a cyclic number.

It is not a de Polignac number, because 1398080861 - 2¹⁴ = 1398064477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398080821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6186086 + ... + 6186311.

It is an arithmetic number, because the mean of its divisors is an integer number (352613343).

Almost surely, 2^1398080861 is an apocalyptic number.

It is an amenable number.

1398080861 is a deficient number, since it is larger than the sum of its proper divisors (12372511).

1398080861 is a wasteful number, since it uses less digits than its factorization.

1398080861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12372510.

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 1398080861 is about 37390.9194992581. The cubic root of 1398080861 is about 1118.1775370018.

The spelling of 1398080861 in words is "one billion, three hundred ninety-eight million, eighty thousand, eight hundred sixty-one".