405739994 has 16 divisors (see below), whose sum is σ = 666592416. Its totient is φ = 183690000.

The previous prime is 405739993. The next prime is 405740011. The reversal of 405739994 is 499937504.

It is a super-2 number, since 2×405739994² = 329249885462240072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (405739993) 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, 31217 + ... + 42260.

It is an arithmetic number, because the mean of its divisors is an integer number (41662026).

Almost surely, 2^405739994 is an apocalyptic number.

405739994 is a deficient number, since it is larger than the sum of its proper divisors (260852422).

405739994 is a wasteful number, since it uses less digits than its factorization.

405739994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73741.

The product of its (nonzero) digits is 1224720, while the sum is 50.

The square root of 405739994 is about 20142.9887057507. The cubic root of 405739994 is about 740.3139610058.

The spelling of 405739994 in words is "four hundred five million, seven hundred thirty-nine thousand, nine hundred ninety-four".