672121 has 4 divisors (see below), whose sum is σ = 674212. Its totient is φ = 670032.

The previous prime is 672107. The next prime is 672127. The reversal of 672121 is 121276.

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 354025 + 318096 = 595^2 + 564^2 .

It is a cyclic number.

It is not a de Polignac number, because 672121 - 2⁹ = 671609 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (672127) 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, 450 + ... + 1243.

It is an arithmetic number, because the mean of its divisors is an integer number (168553).

2⁶⁷²¹²¹ is an apocalyptic number.

It is an amenable number.

672121 is a deficient number, since it is larger than the sum of its proper divisors (2091).

672121 is a wasteful number, since it uses less digits than its factorization.

672121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090.

The product of its digits is 168, while the sum is 19.

The square root of 672121 is about 819.8298603979. The cubic root of 672121 is about 87.5956396431.

Adding to 672121 its reverse (121276), we get a palindrome (793397).

It can be divided in two parts, 6721 and 21, that multiplied together give a palindrome (141141).

The spelling of 672121 in words is "six hundred seventy-two thousand, one hundred twenty-one".