397951128 has 24 divisors (see below), whose sum is σ = 1077784500. Its totient is φ = 132650352.

The previous prime is 397951121. The next prime is 397951153. The reversal of 397951128 is 821159793.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397951121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2763478 + ... + 2763621.

Almost surely, 2^397951128 is an apocalyptic number.

It is an amenable number.

397951128 is an abundant number, since it is smaller than the sum of its proper divisors (679833372).

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

397951128 is a wasteful number, since it uses less digits than its factorization.

397951128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5527111 (or 5527104 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 397951128 is about 19948.7124396538. The cubic root of 397951128 is about 735.5461274989.

The spelling of 397951128 in words is "three hundred ninety-seven million, nine hundred fifty-one thousand, one hundred twenty-eight".