1396681920 has 448 divisors, whose sum is σ = 5378866560. Its totient is φ = 339738624.

The previous prime is 1396681907. The next prime is 1396681927. The reversal of 1396681920 is 291866931.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (1396681927) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5434432 + ... + 5434688.

Almost surely, 2^1396681920 is an apocalyptic number.

1396681920 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 1396681920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2689433280).

1396681920 is an abundant number, since it is smaller than the sum of its proper divisors (3982184640).

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

1396681920 is a wasteful number, since it uses less digits than its factorization.

1396681920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 1396681920 is about 37372.2078555710. The cubic root of 1396681920 is about 1117.8044573806.

The spelling of 1396681920 in words is "one billion, three hundred ninety-six million, six hundred eighty-one thousand, nine hundred twenty".