1897397414640 has 400 divisors, whose sum is σ = 8110700756928. Its totient is φ = 400329879552.

The previous prime is 1897397414629. The next prime is 1897397414663. The reversal of 1897397414640 is 464147937981.

1897397414640 is a `hidden beast` number, since 1 + 8 + 9 + 73 + 97 + 414 + 64 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1019157 + ... + 2198516.

Almost surely, 2^{1897397414640} is an apocalyptic number.

1897397414640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1897397414640 is an abundant number, since it is smaller than the sum of its proper divisors (6213303342288).

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

1897397414640 is a wasteful number, since it uses less digits than its factorization.

1897397414640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3217718 (or 3217703 counting only the distinct ones).

The product of its (nonzero) digits is 36578304, while the sum is 63.

The spelling of 1897397414640 in words is "one trillion, eight hundred ninety-seven billion, three hundred ninety-seven million, four hundred fourteen thousand, six hundred forty".