398522709 has 24 divisors (see below), whose sum is σ = 620652032. Its totient is φ = 244956960.

The previous prime is 398522629. The next prime is 398522711. The reversal of 398522709 is 907225893.

It is not a de Polignac number, because 398522709 - 2⁹ = 398522197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398522749) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 142644 + ... + 145410.

Almost surely, 2^398522709 is an apocalyptic number.

398522709 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

398522709 is a deficient number, since it is larger than the sum of its proper divisors (222129323).

398522709 is a wasteful number, since it uses less digits than its factorization.

398522709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4017 (or 4014 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 398522709 is about 19963.0335620617. The cubic root of 398522709 is about 735.8981163367.

The spelling of 398522709 in words is "three hundred ninety-eight million, five hundred twenty-two thousand, seven hundred nine".