7121738 has 8 divisors (see below), whose sum is σ = 11504388. Its totient is φ = 3286944.

The previous prime is 7121731. The next prime is 7121761. The reversal of 7121738 is 8371217.

It can be written as a sum of positive squares in 2 ways, for example, as 6115729 + 1006009 = 2473^2 + 1003^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 7121738.

It is not an unprimeable number, because it can be changed into a prime (7121731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136931 + ... + 136982.

Almost surely, 2^7121738 is an apocalyptic number.

7121738 is a deficient number, since it is larger than the sum of its proper divisors (4382650).

7121738 is a wasteful number, since it uses less digits than its factorization.

7121738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273928.

The product of its digits is 2352, while the sum is 29.

The square root of 7121738 is about 2668.6584644724. The cubic root of 7121738 is about 192.3956864422.

The spelling of 7121738 in words is "seven million, one hundred twenty-one thousand, seven hundred thirty-eight".