1398901549 has 4 divisors (see below), whose sum is σ = 1408290300. Its totient is φ = 1389512800.

The previous prime is 1398901541. The next prime is 1398901577. The reversal of 1398901549 is 9451098931.

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 147015625 + 1251885924 = 12125^2 + 35382^2 .

It is a cyclic number.

It is not a de Polignac number, because 1398901549 - 2³ = 1398901541 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398901541) 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, 4694152 + ... + 4694449.

It is an arithmetic number, because the mean of its divisors is an integer number (352072575).

Almost surely, 2^1398901549 is an apocalyptic number.

It is an amenable number.

1398901549 is a deficient number, since it is larger than the sum of its proper divisors (9388751).

1398901549 is an equidigital number, since it uses as much as digits as its factorization.

1398901549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9388750.

The product of its (nonzero) digits is 349920, while the sum is 49.

The square root of 1398901549 is about 37401.8923184376. The cubic root of 1398901549 is about 1118.3962881506.

The spelling of 1398901549 in words is "one billion, three hundred ninety-eight million, nine hundred one thousand, five hundred forty-nine".