397138651 has 8 divisors (see below), whose sum is σ = 488786144. Its totient is φ = 314219520.

The previous prime is 397138619. The next prime is 397138663. The reversal of 397138651 is 156831793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 397138651 - 2⁵ = 397138619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 397138598 and 397138607.

It is not an unprimeable number, because it can be changed into a prime (397138691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2181990 + ... + 2182171.

It is an arithmetic number, because the mean of its divisors is an integer number (61098268).

Almost surely, 2^397138651 is an apocalyptic number.

397138651 is a deficient number, since it is larger than the sum of its proper divisors (91647493).

397138651 is a wasteful number, since it uses less digits than its factorization.

397138651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4364181.

The product of its digits is 136080, while the sum is 43.

The square root of 397138651 is about 19928.3378885445. The cubic root of 397138651 is about 735.0452104789.

The spelling of 397138651 in words is "three hundred ninety-seven million, one hundred thirty-eight thousand, six hundred fifty-one".