1396809440 has 96 divisors (see below), whose sum is σ = 3578450400. Its totient is φ = 512169984.

The previous prime is 1396809433. The next prime is 1396809461. The reversal of 1396809440 is 449086931.

It is a super-2 number, since 2×1396809440² = 3902153223346227200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1396809391 and 1396809400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307667 + ... + 312173.

It is an arithmetic number, because the mean of its divisors is an integer number (37275525).

Almost surely, 2^1396809440 is an apocalyptic number.

1396809440 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 1396809440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1789225200).

1396809440 is an abundant number, since it is smaller than the sum of its proper divisors (2181640960).

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

1396809440 is a wasteful number, since it uses less digits than its factorization.

1396809440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4684 (or 4676 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 1396809440 is about 37373.9138972626. The cubic root of 1396809440 is about 1117.8384756454.

The spelling of 1396809440 in words is "one billion, three hundred ninety-six million, eight hundred nine thousand, four hundred forty".