40001405 has 8 divisors (see below), whose sum is σ = 48089184. Its totient is φ = 31942800.

The previous prime is 40001399. The next prime is 40001407. The reversal of 40001405 is 50410004.

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

It is a de Polignac number, because none of the positive numbers 2^k-40001405 is a prime.

It is a super-2 number, since 2×40001405² = 3200224803948050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40001405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40001407) 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, 4151 + ... + 9860.

It is an arithmetic number, because the mean of its divisors is an integer number (6011148).

Almost surely, 2^40001405 is an apocalyptic number.

It is an amenable number.

40001405 is a deficient number, since it is larger than the sum of its proper divisors (8087779).

40001405 is a wasteful number, since it uses less digits than its factorization.

40001405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14587.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 40001405 is about 6324.6663943642. Note that the first 3 decimals coincide. The cubic root of 40001405 is about 341.9991934821. Note that the first 3 decimals are identical.

Adding to 40001405 its reverse (50410004), we get a palindrome (90411409).

The spelling of 40001405 in words is "forty million, one thousand, four hundred five".