1398249388 has 24 divisors (see below), whose sum is σ = 2660902272. Its totient is φ = 640214784.

The previous prime is 1398249367. The next prime is 1398249407. The reversal of 1398249388 is 8839428931.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 275356 + ... + 280387.

It is an arithmetic number, because the mean of its divisors is an integer number (110870928).

Almost surely, 2^1398249388 is an apocalyptic number.

It is an amenable number.

1398249388 is a deficient number, since it is larger than the sum of its proper divisors (1262652884).

1398249388 is a wasteful number, since it uses less digits than its factorization.

1398249388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555801 (or 555799 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 55.

The square root of 1398249388 is about 37393.1730132654. The cubic root of 1398249388 is about 1118.2224641921. Note that the first 3 decimals are identical.

The spelling of 1398249388 in words is "one billion, three hundred ninety-eight million, two hundred forty-nine thousand, three hundred eighty-eight".