1398981 has 8 divisors (see below), whose sum is σ = 1975104. Its totient is φ = 877760.

The previous prime is 1398979. The next prime is 1398997. The reversal of 1398981 is 1898931.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1398981 - 2¹ = 1398979 is a prime.

It is a super-2 number, since 2×1398981² = 3914295676722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398911) 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, 13665 + ... + 13766.

It is an arithmetic number, because the mean of its divisors is an integer number (246888).

2^1398981 is an apocalyptic number.

It is an amenable number.

1398981 is a deficient number, since it is larger than the sum of its proper divisors (576123).

1398981 is a wasteful number, since it uses less digits than its factorization.

1398981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27451.

The product of its digits is 15552, while the sum is 39.

The square root of 1398981 is about 1182.7852721437. The cubic root of 1398981 is about 111.8417460959.

The spelling of 1398981 in words is "one million, three hundred ninety-eight thousand, nine hundred eighty-one".