1397940512864 has 24 divisors (see below), whose sum is σ = 3145366154448. Its totient is φ = 599117362560.

The previous prime is 1397940512861. The next prime is 1397940512887. The reversal of 1397940512864 is 4682150497931.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397940512861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3120402707 + ... + 3120403154.

It is an arithmetic number, because the mean of its divisors is an integer number (131056923102).

It is a 1-persistent number, because it is pandigital, but 2⋅1397940512864 = 2795881025728 is not.

Almost surely, 2^{1397940512864} is an apocalyptic number.

1397940512864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1397940512864 is an abundant number, since it is smaller than the sum of its proper divisors (1747425641584).

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

1397940512864 is an equidigital number, since it uses as much as digits as its factorization.

1397940512864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6240805878 (or 6240805870 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 59.

The spelling of 1397940512864 in words is "one trillion, three hundred ninety-seven billion, nine hundred forty million, five hundred twelve thousand, eight hundred sixty-four".