238709421 has 12 divisors (see below), whose sum is σ = 353212860. Its totient is φ = 155257920.

The previous prime is 238709417. The next prime is 238709423. The reversal of 238709421 is 124907832.

It can be written as a sum of positive squares in 2 ways, for example, as 109432521 + 129276900 = 10461^2 + 11370^2 .

It is not a de Polignac number, because 238709421 - 2² = 238709417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (238709423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 323086 + ... + 323823.

It is an arithmetic number, because the mean of its divisors is an integer number (29434405).

Almost surely, 2^238709421 is an apocalyptic number.

It is an amenable number.

238709421 is a deficient number, since it is larger than the sum of its proper divisors (114503439).

238709421 is a wasteful number, since it uses less digits than its factorization.

238709421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646956 (or 646953 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 238709421 is about 15450.2239789590. The cubic root of 238709421 is about 620.3305737989.

The spelling of 238709421 in words is "two hundred thirty-eight million, seven hundred nine thousand, four hundred twenty-one".