405981193 has 8 divisors (see below), whose sum is σ = 407635200. Its totient is φ = 404331648.

The previous prime is 405981143. The next prime is 405981197. The reversal of 405981193 is 391189504.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405981193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405981197) 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, 483468 + ... + 484306.

It is an arithmetic number, because the mean of its divisors is an integer number (50954400).

Almost surely, 2^405981193 is an apocalyptic number.

It is an amenable number.

405981193 is a deficient number, since it is larger than the sum of its proper divisors (1654007).

405981193 is an equidigital number, since it uses as much as digits as its factorization.

405981193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2231.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 405981193 is about 20148.9749863362. The cubic root of 405981193 is about 740.4606293304.

The spelling of 405981193 in words is "four hundred five million, nine hundred eighty-one thousand, one hundred ninety-three".