740002121 has 4 divisors (see below), whose sum is σ = 740187012. Its totient is φ = 739817232.

The previous prime is 740002103. The next prime is 740002141. The reversal of 740002121 is 121200047.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 166926400 + 573075721 = 12920^2 + 23939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-740002121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 740002121.

It is not an unprimeable number, because it can be changed into a prime (740002141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86306 + ... + 94491.

It is an arithmetic number, because the mean of its divisors is an integer number (185046753).

Almost surely, 2^740002121 is an apocalyptic number.

It is an amenable number.

740002121 is a deficient number, since it is larger than the sum of its proper divisors (184891).

740002121 is a wasteful number, since it uses less digits than its factorization.

740002121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184890.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 740002121 is about 27202.9800021983. The cubic root of 740002121 is about 904.5050338184.

Adding to 740002121 its reverse (121200047), we get a palindrome (861202168).

The spelling of 740002121 in words is "seven hundred forty million, two thousand, one hundred twenty-one".