397748649 has 8 divisors (see below), whose sum is σ = 538247200. Its totient is φ = 261207936.

The previous prime is 397748629. The next prime is 397748651. The reversal of 397748649 is 946847793.

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

It is not a de Polignac number, because 397748649 - 2¹² = 397744553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397748629) 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, 989224 + ... + 989625.

It is an arithmetic number, because the mean of its divisors is an integer number (67280900).

Almost surely, 2^397748649 is an apocalyptic number.

It is an amenable number.

397748649 is a deficient number, since it is larger than the sum of its proper divisors (140498551).

397748649 is a wasteful number, since it uses less digits than its factorization.

397748649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978919.

The product of its digits is 9144576, while the sum is 57.

The square root of 397748649 is about 19943.6368047555. The cubic root of 397748649 is about 735.4213568088.

The spelling of 397748649 in words is "three hundred ninety-seven million, seven hundred forty-eight thousand, six hundred forty-nine".