398742737 has 2 divisors, whose sum is σ = 398742738. Its totient is φ = 398742736.

The previous prime is 398742731. The next prime is 398742749. The reversal of 398742737 is 737247893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 387459856 + 11282881 = 19684^2 + 3359^2 .

It is a cyclic number.

It is not a de Polignac number, because 398742737 - 2⁸ = 398742481 is a prime.

It is not a weakly prime, because it can be changed into another prime (398742731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199371368 + 199371369.

It is an arithmetic number, because the mean of its divisors is an integer number (199371369).

Almost surely, 2^398742737 is an apocalyptic number.

It is an amenable number.

398742737 is a deficient number, since it is larger than the sum of its proper divisors (1).

398742737 is an equidigital number, since it uses as much as digits as its factorization.

398742737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 50.

The square root of 398742737 is about 19968.5436875101. The cubic root of 398742737 is about 736.0335234268.

The spelling of 398742737 in words is "three hundred ninety-eight million, seven hundred forty-two thousand, seven hundred thirty-seven".