672981 has 4 divisors (see below), whose sum is σ = 897312. Its totient is φ = 448652.

The previous prime is 672977. The next prime is 672983. The reversal of 672981 is 189276.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 672981 - 2² = 672977 is a prime.

It is a super-2 number, since 2×672981² = 905806852722, which contains 22 as substring.

It is a D-number.

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

672981 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 672981.

It is not an unprimeable number, because it can be changed into a prime (672983) 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, 112161 + ... + 112166.

It is an arithmetic number, because the mean of its divisors is an integer number (224328).

2⁶⁷²⁹⁸¹ is an apocalyptic number.

It is an amenable number.

672981 is a deficient number, since it is larger than the sum of its proper divisors (224331).

672981 is a wasteful number, since it uses less digits than its factorization.

672981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224330.

The product of its digits is 6048, while the sum is 33.

The square root of 672981 is about 820.3541917977. The cubic root of 672981 is about 87.6329841803.

It can be divided in two parts, 672 and 981, that added together give a triangular number (1653 = T₅₇).

The spelling of 672981 in words is "six hundred seventy-two thousand, nine hundred eighty-one".