398776729 has 16 divisors (see below), whose sum is σ = 434201152. Its totient is φ = 364056768.

The previous prime is 398776649. The next prime is 398776733. The reversal of 398776729 is 927677893.

It is a cyclic number.

It is not a de Polignac number, because 398776729 - 2²³ = 390388121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (398776789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 650227 + ... + 650839.

It is an arithmetic number, because the mean of its divisors is an integer number (27137572).

Almost surely, 2^398776729 is an apocalyptic number.

It is an amenable number.

398776729 is a deficient number, since it is larger than the sum of its proper divisors (35424423).

398776729 is a wasteful number, since it uses less digits than its factorization.

398776729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096.

The product of its digits is 8001504, while the sum is 58.

The square root of 398776729 is about 19969.3948080557. The cubic root of 398776729 is about 736.0544379483.

The spelling of 398776729 in words is "three hundred ninety-eight million, seven hundred seventy-six thousand, seven hundred twenty-nine".