1398988403 has 4 divisors (see below), whose sum is σ = 1401348168. Its totient is φ = 1396628640.

The previous prime is 1398988399. The next prime is 1398988421. The reversal of 1398988403 is 3048898931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3048898931 = 13 ⋅234530687.

It is a cyclic number.

It is not a de Polignac number, because 1398988403 - 2² = 1398988399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1398988483) 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, 1178993 + ... + 1180178.

It is an arithmetic number, because the mean of its divisors is an integer number (350337042).

Almost surely, 2^1398988403 is an apocalyptic number.

1398988403 is a deficient number, since it is larger than the sum of its proper divisors (2359765).

1398988403 is an equidigital number, since it uses as much as digits as its factorization.

1398988403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2359764.

The product of its (nonzero) digits is 1492992, while the sum is 53.

The square root of 1398988403 is about 37403.0533914011. The cubic root of 1398988403 is about 1118.4194337349.

The spelling of 1398988403 in words is "one billion, three hundred ninety-eight million, nine hundred eighty-eight thousand, four hundred three".