397913187042 has 160 divisors (see below), whose sum is σ = 1073379732480. Its totient is φ = 107630143200.

The previous prime is 397913187041. The next prime is 397913187043. The reversal of 397913187042 is 240781319793.

397913187042 is a `hidden beast` number, since 397 + 9 + 131 + 87 + 0 + 42 = 666.

It is an interprime number because it is at equal distance from previous prime (397913187041) and next prime (397913187043).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 397913187042.

It is not an unprimeable number, because it can be changed into a prime (397913187041) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 35049667 + ... + 35061017.

It is an arithmetic number, because the mean of its divisors is an integer number (6708623328).

Almost surely, 2^397913187042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 397913187042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (536689866240).

397913187042 is an abundant number, since it is smaller than the sum of its proper divisors (675466545438).

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

397913187042 is a wasteful number, since it uses less digits than its factorization.

397913187042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13018 (or 13009 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 54.

The spelling of 397913187042 in words is "three hundred ninety-seven billion, nine hundred thirteen million, one hundred eighty-seven thousand, forty-two".