1397440512 has 270 divisors, whose sum is σ = 4514440658. Its totient is φ = 429981696.

The previous prime is 1397440493. The next prime is 1397440529. The reversal of 1397440512 is 2150447931.

1397440512 is a `hidden beast` number, since 1 + 39 + 74 + 40 + 512 = 666.

It can be written as a sum of positive squares in only one way, i.e., 967458816 + 429981696 = 31104^2 + 20736^2 .

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

It is a nialpdrome in base 12.

It is a zygodrome in base 12.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 107495418 + ... + 107495430.

Almost surely, 2^1397440512 is an apocalyptic number.

1397440512 is a gapful number since it is divisible by the number (12) 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 1397440512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2257220329).

1397440512 is an abundant number, since it is smaller than the sum of its proper divisors (3117000146).

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

1397440512 is an frugal number, since it uses more digits than its factorization.

1397440512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65 (or 18 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 1397440512 is about 37382.3556240106. The cubic root of 1397440512 is about 1118.0067950385.

The spelling of 1397440512 in words is "one billion, three hundred ninety-seven million, four hundred forty thousand, five hundred twelve".