1399978406970 has 256 divisors, whose sum is σ = 4576642560000. Its totient is φ = 299660739840.

The previous prime is 1399978406941. The next prime is 1399978406971. The reversal of 1399978406970 is 796048799931.

1399978406970 is a `hidden beast` number, since 1 + 399 + 9 + 78 + 40 + 69 + 70 = 666.

It is not an unprimeable number, because it can be changed into a prime (1399978406971) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 99781 + ... + 1676279.

It is an arithmetic number, because the mean of its divisors is an integer number (17877510000).

Almost surely, 2^{1399978406970} is an apocalyptic number.

1399978406970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1399978406970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2288321280000).

1399978406970 is an abundant number, since it is smaller than the sum of its proper divisors (3176664153030).

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

1399978406970 is a wasteful number, since it uses less digits than its factorization.

1399978406970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1576562 (or 1576556 counting only the distinct ones).

The product of its (nonzero) digits is 185177664, while the sum is 72.

The spelling of 1399978406970 in words is "one trillion, three hundred ninety-nine billion, nine hundred seventy-eight million, four hundred six thousand, nine hundred seventy".