398662697 has 4 divisors (see below), whose sum is σ = 411522816. Its totient is φ = 385802580.

The previous prime is 398662669. The next prime is 398662727. The reversal of 398662697 is 796266893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 398662697 - 2¹⁶ = 398597161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398662097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6430013 + ... + 6430074.

It is an arithmetic number, because the mean of its divisors is an integer number (102880704).

Almost surely, 2^398662697 is an apocalyptic number.

It is an amenable number.

398662697 is a deficient number, since it is larger than the sum of its proper divisors (12860119).

398662697 is a wasteful number, since it uses less digits than its factorization.

398662697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12860118.

The product of its digits is 5878656, while the sum is 56.

The square root of 398662697 is about 19966.5394347644. The cubic root of 398662697 is about 735.9842719002.

The spelling of 398662697 in words is "three hundred ninety-eight million, six hundred sixty-two thousand, six hundred ninety-seven".