398897707 has 16 divisors (see below), whose sum is σ = 455529312. Its totient is φ = 346037760.

The previous prime is 398897683. The next prime is 398897711. The reversal of 398897707 is 707798893.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 398897707 - 2¹¹ = 398895659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398897207) 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, 288157 + ... + 289537.

It is an arithmetic number, because the mean of its divisors is an integer number (28470582).

Almost surely, 2^398897707 is an apocalyptic number.

398897707 is a deficient number, since it is larger than the sum of its proper divisors (56631605).

398897707 is a wasteful number, since it uses less digits than its factorization.

398897707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2718.

The product of its (nonzero) digits is 5334336, while the sum is 58.

The square root of 398897707 is about 19972.4236636418. The cubic root of 398897707 is about 736.1288633799.

The spelling of 398897707 in words is "three hundred ninety-eight million, eight hundred ninety-seven thousand, seven hundred seven".