1398492831 has 4 divisors (see below), whose sum is σ = 1864657112. Its totient is φ = 932328552.

The previous prime is 1398492803. The next prime is 1398492833. The reversal of 1398492831 is 1382948931.

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

It is not a de Polignac number, because 1398492831 - 2¹¹ = 1398490783 is a prime.

It is a super-2 number, since 2×1398492831² = 3911564396716789122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398492833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233082136 + ... + 233082141.

It is an arithmetic number, because the mean of its divisors is an integer number (466164278).

Almost surely, 2^1398492831 is an apocalyptic number.

1398492831 is a deficient number, since it is larger than the sum of its proper divisors (466164281).

1398492831 is an equidigital number, since it uses as much as digits as its factorization.

1398492831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466164280.

The product of its digits is 373248, while the sum is 48.

The square root of 1398492831 is about 37396.4280513527. The cubic root of 1398492831 is about 1118.2873566776.

The spelling of 1398492831 in words is "one billion, three hundred ninety-eight million, four hundred ninety-two thousand, eight hundred thirty-one".