398495501 has 2 divisors, whose sum is σ = 398495502. Its totient is φ = 398495500.

The previous prime is 398495443. The next prime is 398495507. The reversal of 398495501 is 105594893.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 397962601 + 532900 = 19949^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 398495501 - 2⁶ = 398495437 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398495507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199247750 + 199247751.

It is an arithmetic number, because the mean of its divisors is an integer number (199247751).

Almost surely, 2^398495501 is an apocalyptic number.

It is an amenable number.

398495501 is a deficient number, since it is larger than the sum of its proper divisors (1).

398495501 is an equidigital number, since it uses as much as digits as its factorization.

398495501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 398495501 is about 19962.3520908735. The cubic root of 398495501 is about 735.8813688414.

The spelling of 398495501 in words is "three hundred ninety-eight million, four hundred ninety-five thousand, five hundred one".