1398644500 has 48 divisors (see below), whose sum is σ = 3332347200. Its totient is φ = 508596000.

The previous prime is 1398644479. The next prime is 1398644543. The reversal of 1398644500 is 54468931.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 121650 + ... + 132649.

It is an arithmetic number, because the mean of its divisors is an integer number (69423900).

Almost surely, 2^1398644500 is an apocalyptic number.

1398644500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1398644500 is an abundant number, since it is smaller than the sum of its proper divisors (1933702700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1398644500 is a wasteful number, since it uses less digits than its factorization.

1398644500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254329 (or 254317 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 1398644500 is about 37398.4558504760. The cubic root of 1398644500 is about 1118.3277819578.

Subtracting from 1398644500 its reverse (54468931), we obtain a square (1344175569 = 36663²).

The spelling of 1398644500 in words is "one billion, three hundred ninety-eight million, six hundred forty-four thousand, five hundred".