1397944620 has 144 divisors (see below), whose sum is σ = 4381497120. Its totient is φ = 360557568.

The previous prime is 1397944573. The next prime is 1397944649. The reversal of 1397944620 is 264497931.

It is a happy number.

1397944620 is a `hidden beast` number, since 13 + 9 + 7 + 9 + 4 + 4 + 620 = 666.

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 47 ways as a sum of consecutive naturals, for example, 842832 + ... + 844488.

Almost surely, 2^1397944620 is an apocalyptic number.

1397944620 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 1397944620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2190748560).

1397944620 is an abundant number, since it is smaller than the sum of its proper divisors (2983552500).

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

1397944620 is a wasteful number, since it uses less digits than its factorization.

1397944620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824 (or 1819 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 1397944620 is about 37389.0976087950. The cubic root of 1397944620 is about 1118.1412142161.

The spelling of 1397944620 in words is "one billion, three hundred ninety-seven million, nine hundred forty-four thousand, six hundred twenty".