1997420630400 has 2304 divisors, whose sum is σ = 8701318080000. Its totient is φ = 430937210880.

The previous prime is 1997420630341. The next prime is 1997420630437. The reversal of 1997420630400 is 40360247991.

It is a happy number.

1997420630400 is a `hidden beast` number, since 1 + 9 + 9 + 7 + 4 + 2 + 0 + 630 + 4 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 10037289501 + ... + 10037289699.

It is an arithmetic number, because the mean of its divisors is an integer number (3776613750).

Almost surely, 2^{1997420630400} is an apocalyptic number.

1997420630400 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 1997420630400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4350659040000).

1997420630400 is an abundant number, since it is smaller than the sum of its proper divisors (6703897449600).

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

1997420630400 is a wasteful number, since it uses less digits than its factorization.

1997420630400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361 (or 341 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The spelling of 1997420630400 in words is "one trillion, nine hundred ninety-seven billion, four hundred twenty million, six hundred thirty thousand, four hundred".