398467661 has 2 divisors, whose sum is σ = 398467662. Its totient is φ = 398467660.

The previous prime is 398467603. The next prime is 398467669. The reversal of 398467661 is 166764893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 290702500 + 107765161 = 17050^2 + 10381^2 .

It is a cyclic number.

It is not a de Polignac number, because 398467661 - 2¹⁰ = 398466637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398467669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199233830 + 199233831.

It is an arithmetic number, because the mean of its divisors is an integer number (199233831).

Almost surely, 2^398467661 is an apocalyptic number.

It is an amenable number.

398467661 is a deficient number, since it is larger than the sum of its proper divisors (1).

398467661 is an equidigital number, since it uses as much as digits as its factorization.

398467661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 50.

The square root of 398467661 is about 19961.6547660759. The cubic root of 398467661 is about 735.8642315384.

The spelling of 398467661 in words is "three hundred ninety-eight million, four hundred sixty-seven thousand, six hundred sixty-one".