1394007840 has 192 divisors, whose sum is σ = 4913637120. Its totient is φ = 369100800.

The previous prime is 1394007773. The next prime is 1394007863. The reversal of 1394007840 is 487004931.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1394007795 and 1394007804.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 651252 + ... + 653388.

It is an arithmetic number, because the mean of its divisors is an integer number (25591860).

Almost surely, 2^1394007840 is an apocalyptic number.

1394007840 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 1394007840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2456818560).

1394007840 is an abundant number, since it is smaller than the sum of its proper divisors (3519629280).

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

1394007840 is a wasteful number, since it uses less digits than its factorization.

1394007840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2312 (or 2298 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 1394007840 is about 37336.4143966718. The cubic root of 1394007840 is about 1117.0906207344.

The spelling of 1394007840 in words is "one billion, three hundred ninety-four million, seven thousand, eight hundred forty".