121738 has 4 divisors (see below), whose sum is σ = 182610. Its totient is φ = 60868.

The previous prime is 121727. The next prime is 121763. The reversal of 121738 is 837121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 837121 = 19 ⋅44059.

It can be written as a sum of positive squares in only one way, i.e., 91809 + 29929 = 303^2 + 173^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30433 + ... + 30436.

2¹²¹⁷³⁸ is an apocalyptic number.

121738 is the 187-th centered heptagonal number.

121738 is a deficient number, since it is larger than the sum of its proper divisors (60872).

121738 is an equidigital number, since it uses as much as digits as its factorization.

121738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60871.

The product of its digits is 336, while the sum is 22.

The square root of 121738 is about 348.9097304461. The cubic root of 121738 is about 49.5612275037.

Adding to 121738 its reverse (837121), we get a palindrome (958859).

It can be divided in two parts, 121 and 738, that multiplied together give a palindrome (89298).

The spelling of 121738 in words is "one hundred twenty-one thousand, seven hundred thirty-eight".