397778337792 has 360 divisors, whose sum is σ = 1264091092992. Its totient is φ = 119527833600.

The previous prime is 397778337787. The next prime is 397778337793. The reversal of 397778337792 is 297733877793.

397778337792 is a `hidden beast` number, since 3 + 97 + 7 + 7 + 83 + 377 + 92 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 397778337792.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397778337793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 205995067 + ... + 205996997.

Almost surely, 2^397778337792 is an apocalyptic number.

397778337792 is a gapful number since it is divisible by the number (32) 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 397778337792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (632045546496).

397778337792 is an abundant number, since it is smaller than the sum of its proper divisors (866312755200).

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

397778337792 is a wasteful number, since it uses less digits than its factorization.

397778337792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2103 (or 2074 counting only the distinct ones).

The product of its digits is 588110544, while the sum is 72.

The spelling of 397778337792 in words is "three hundred ninety-seven billion, seven hundred seventy-eight million, three hundred thirty-seven thousand, seven hundred ninety-two".