397211855040 has 1344 divisors, whose sum is σ = 1845912886272. Its totient is φ = 75711283200.

The previous prime is 397211855021. The next prime is 397211855093. The reversal of 397211855040 is 40558112793.

397211855040 is a `hidden beast` number, since 3 + 97 + 2 + 1 + 1 + 8 + 550 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1344).

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

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 608287354 + ... + 608288006.

It is an arithmetic number, because the mean of its divisors is an integer number (1373447088).

Almost surely, 2^397211855040 is an apocalyptic number.

397211855040 is a gapful number since it is divisible by the number (30) 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 397211855040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (922956443136).

397211855040 is an abundant number, since it is smaller than the sum of its proper divisors (1448701031232).

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

397211855040 is a wasteful number, since it uses less digits than its factorization.

397211855040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918 (or 905 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 397211855040 in words is "three hundred ninety-seven billion, two hundred eleven million, eight hundred fifty-five thousand, forty".