397001221 has 16 divisors (see below), whose sum is σ = 434972160. Its totient is φ = 360714240.

The previous prime is 397001177. The next prime is 397001233. The reversal of 397001221 is 122100793.

It is a cyclic number.

It is not a de Polignac number, because 397001221 - 2²⁵ = 363446789 is a prime.

397001221 is a modest number, since divided by 1221 gives 397 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397001291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 325605 + ... + 326821.

It is an arithmetic number, because the mean of its divisors is an integer number (27185760).

Almost surely, 2^397001221 is an apocalyptic number.

397001221 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

397001221 is a deficient number, since it is larger than the sum of its proper divisors (37970939).

397001221 is a wasteful number, since it uses less digits than its factorization.

397001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1884.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 397001221 is about 19924.8894852644. The cubic root of 397001221 is about 734.9604131270.

The spelling of 397001221 in words is "three hundred ninety-seven million, one thousand, two hundred twenty-one".