766981 has 4 divisors (see below), whose sum is σ = 800352. Its totient is φ = 733612.

The previous prime is 766967. The next prime is 766999. The reversal of 766981 is 189667.

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, and also an emirpimes, since its reverse is a distinct semiprime: 189667 = 241 ⋅787.

It is a cyclic number.

It is not a de Polignac number, because 766981 - 2¹³ = 758789 is a prime.

It is a super-2 number, since 2×766981² = 1176519708722, which contains 22 as substring.

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 766981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766901) 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, 16651 + ... + 16696.

It is an arithmetic number, because the mean of its divisors is an integer number (200088).

2⁷⁶⁶⁹⁸¹ is an apocalyptic number.

It is an amenable number.

766981 is a deficient number, since it is larger than the sum of its proper divisors (33371).

766981 is a wasteful number, since it uses less digits than its factorization.

766981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33370.

The product of its digits is 18144, while the sum is 37.

The square root of 766981 is about 875.7745143586. The cubic root of 766981 is about 91.5366192622.

It can be divided in two parts, 7669 and 81, that added together give a triangular number (7750 = T₁₂₄).

The spelling of 766981 in words is "seven hundred sixty-six thousand, nine hundred eighty-one".