238978651 has 2 divisors, whose sum is σ = 238978652. Its totient is φ = 238978650.

The previous prime is 238978631. The next prime is 238978661. The reversal of 238978651 is 156879832.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 238978651 - 2¹¹ = 238976603 is a prime.

It is a super-2 number, since 2×238978651² = 114221591267559602, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 238978595 and 238978604.

It is not a weakly prime, because it can be changed into another prime (238978631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119489325 + 119489326.

It is an arithmetic number, because the mean of its divisors is an integer number (119489326).

Almost surely, 2^238978651 is an apocalyptic number.

238978651 is a deficient number, since it is larger than the sum of its proper divisors (1).

238978651 is an equidigital number, since it uses as much as digits as its factorization.

238978651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 49.

The square root of 238978651 is about 15458.9343423148. The cubic root of 238978651 is about 620.5637008237.

The spelling of 238978651 in words is "two hundred thirty-eight million, nine hundred seventy-eight thousand, six hundred fifty-one".