1397021666240 has 224 divisors, whose sum is σ = 3483767439360. Its totient is φ = 532965888000.

The previous prime is 1397021666171. The next prime is 1397021666267. The reversal of 1397021666240 is 426661207931.

It is a congruent number.

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, 549358409 + ... + 549360951.

Almost surely, 2^{1397021666240} is an apocalyptic number.

1397021666240 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 1397021666240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1741883719680).

1397021666240 is an abundant number, since it is smaller than the sum of its proper divisors (2086745773120).

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

1397021666240 is a wasteful number, since it uses less digits than its factorization.

1397021666240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3371 (or 3361 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 1397021666240 in words is "one trillion, three hundred ninety-seven billion, twenty-one million, six hundred sixty-six thousand, two hundred forty".