1398920591 has 4 divisors (see below), whose sum is σ = 1431453672. Its totient is φ = 1366387512.

The previous prime is 1398920431. The next prime is 1398920617. The reversal of 1398920591 is 1950298931.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1398920591 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 (1398920791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16266476 + ... + 16266561.

It is an arithmetic number, because the mean of its divisors is an integer number (357863418).

Almost surely, 2^1398920591 is an apocalyptic number.

1398920591 is a deficient number, since it is larger than the sum of its proper divisors (32533081).

1398920591 is an equidigital number, since it uses as much as digits as its factorization.

1398920591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32533080.

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 1398920591 is about 37402.1468768840. The cubic root of 1398920591 is about 1118.4013627049.

The spelling of 1398920591 in words is "one billion, three hundred ninety-eight million, nine hundred twenty thousand, five hundred ninety-one".