1398939821 has 8 divisors (see below), whose sum is σ = 1462348800. Its totient is φ = 1336673520.

The previous prime is 1398939811. The next prime is 1398939827. The reversal of 1398939821 is 1289398931.

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 1398939821 - 2⁶ = 1398939757 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 (1398939827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283166 + ... + 288063.

It is an arithmetic number, because the mean of its divisors is an integer number (182793600).

Almost surely, 2^1398939821 is an apocalyptic number.

It is an amenable number.

1398939821 is a deficient number, since it is larger than the sum of its proper divisors (63408979).

1398939821 is an equidigital number, since it uses as much as digits as its factorization.

1398939821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571339.

The product of its digits is 839808, while the sum is 53.

The square root of 1398939821 is about 37402.4039468053. The cubic root of 1398939821 is about 1118.4064873131.

The spelling of 1398939821 in words is "one billion, three hundred ninety-eight million, nine hundred thirty-nine thousand, eight hundred twenty-one".