1398240440 has 16 divisors (see below), whose sum is σ = 3146041080. Its totient is φ = 559296160.

The previous prime is 1398240439. The next prime is 1398240443. The reversal of 1398240440 is 440428931.

It is a self number, because there is not a number n which added to its sum of digits gives 1398240440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1398240443) 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, 17477966 + ... + 17478045.

Almost surely, 2^1398240440 is an apocalyptic number.

1398240440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1398240440 is an abundant number, since it is smaller than the sum of its proper divisors (1747800640).

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

1398240440 is a wasteful number, since it uses less digits than its factorization.

1398240440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34956022 (or 34956018 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 1398240440 is about 37393.0533655651. The cubic root of 1398240440 is about 1118.2200788580.

The spelling of 1398240440 in words is "one billion, three hundred ninety-eight million, two hundred forty thousand, four hundred forty".