238998997 has 2 divisors, whose sum is σ = 238998998. Its totient is φ = 238998996.

The previous prime is 238998923. The next prime is 238999001. The reversal of 238998997 is 799899832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120428676 + 118570321 = 10974^2 + 10889^2 .

It is a cyclic number.

It is not a de Polignac number, because 238998997 - 2²⁷ = 104781269 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 (238992997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119499498 + 119499499.

It is an arithmetic number, because the mean of its divisors is an integer number (119499499).

Almost surely, 2^238998997 is an apocalyptic number.

It is an amenable number.

238998997 is a deficient number, since it is larger than the sum of its proper divisors (1).

238998997 is an equidigital number, since it uses as much as digits as its factorization.

238998997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17635968, while the sum is 64.

The square root of 238998997 is about 15459.5923943680. The cubic root of 238998997 is about 620.5813113657.

It can be divided in two parts, 23899 and 8997, that added together give a triangular number (32896 = T₂₅₆).

The spelling of 238998997 in words is "two hundred thirty-eight million, nine hundred ninety-eight thousand, nine hundred ninety-seven".