405689372 has 12 divisors (see below), whose sum is σ = 774497976. Its totient is φ = 184404240.

The previous prime is 405689371. The next prime is 405689399. The reversal of 405689372 is 273986504.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 9220213 = 405689372 / (4 + 0 + 5 + 6 + 8 + 9 + 3 + 7 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405689371) 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, 4610063 + ... + 4610150.

It is an arithmetic number, because the mean of its divisors is an integer number (64541498).

Almost surely, 2^405689372 is an apocalyptic number.

It is an amenable number.

405689372 is a deficient number, since it is larger than the sum of its proper divisors (368808604).

405689372 is a wasteful number, since it uses less digits than its factorization.

405689372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9220228 (or 9220226 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 405689372 is about 20141.7321002937. The cubic root of 405689372 is about 740.2831713929.

The spelling of 405689372 in words is "four hundred five million, six hundred eighty-nine thousand, three hundred seventy-two".