398172771 has 12 divisors (see below), whose sum is σ = 589166760. Its totient is φ = 258973920.

The previous prime is 398172763. The next prime is 398172823. The reversal of 398172771 is 177271893.

It is not a de Polignac number, because 398172771 - 2³ = 398172763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (398173771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 539161 + ... + 539898.

It is an arithmetic number, because the mean of its divisors is an integer number (49097230).

Almost surely, 2^398172771 is an apocalyptic number.

398172771 is a deficient number, since it is larger than the sum of its proper divisors (190993989).

398172771 is a wasteful number, since it uses less digits than its factorization.

398172771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079106 (or 1079103 counting only the distinct ones).

The product of its digits is 148176, while the sum is 45.

The square root of 398172771 is about 19954.2669872887. The cubic root of 398172771 is about 735.6826588310.

The spelling of 398172771 in words is "three hundred ninety-eight million, one hundred seventy-two thousand, seven hundred seventy-one".