1393489440 has 576 divisors, whose sum is σ = 5894985600. Its totient is φ = 306173952.

The previous prime is 1393489423. The next prime is 1393489451. The reversal of 1393489440 is 449843931.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6138607 + ... + 6138833.

It is an arithmetic number, because the mean of its divisors is an integer number (10234350).

Almost surely, 2^1393489440 is an apocalyptic number.

1393489440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1393489440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2947492800).

1393489440 is an abundant number, since it is smaller than the sum of its proper divisors (4501496160).

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

1393489440 is a wasteful number, since it uses less digits than its factorization.

1393489440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 273 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 1393489440 is about 37329.4714669254. The cubic root of 1393489440 is about 1116.9521299836.

The spelling of 1393489440 in words is "one billion, three hundred ninety-three million, four hundred eighty-nine thousand, four hundred forty".