405980981 has 8 divisors (see below), whose sum is σ = 484151424. Its totient is φ = 332853840.

The previous prime is 405980969. The next prime is 405981011. The reversal of 405980981 is 189089504.

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

It is a cyclic number.

It is not a de Polignac number, because 405980981 - 2¹⁴ = 405964597 is a prime.

It is a super-2 number, since 2×405980981² = 329641113867444722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405980941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1260650 + ... + 1260971.

It is an arithmetic number, because the mean of its divisors is an integer number (60518928).

Almost surely, 2^405980981 is an apocalyptic number.

It is an amenable number.

405980981 is a deficient number, since it is larger than the sum of its proper divisors (78170443).

405980981 is a wasteful number, since it uses less digits than its factorization.

405980981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2521651.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 405980981 is about 20148.9697255219. The cubic root of 405980981 is about 740.4605004430.

The spelling of 405980981 in words is "four hundred five million, nine hundred eighty thousand, nine hundred eighty-one".