405874172 has 18 divisors (see below), whose sum is σ = 780721704. Its totient is φ = 184488040.

The previous prime is 405874171. The next prime is 405874193. The reversal of 405874172 is 271478504.

Added to its reverse (271478504) it gives a square (677352676 = 26026²).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405874171) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 418808 + ... + 419775.

It is an arithmetic number, because the mean of its divisors is an integer number (43373428).

Almost surely, 2^405874172 is an apocalyptic number.

It is an amenable number.

405874172 is a deficient number, since it is larger than the sum of its proper divisors (374847532).

405874172 is a wasteful number, since it uses less digits than its factorization.

405874172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838609 (or 838596 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 38.

The square root of 405874172 is about 20146.3190682566. The cubic root of 405874172 is about 740.3955591559.

Adding to 405874172 its reverse (271478504), we get a square (677352676 = 26026²).

The spelling of 405874172 in words is "four hundred five million, eight hundred seventy-four thousand, one hundred seventy-two".