40606391 has 8 divisors (see below), whose sum is σ = 47061504. Its totient is φ = 34314840.

The previous prime is 40606381. The next prime is 40606403. The reversal of 40606391 is 19360604.

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

It is not a de Polignac number, because 40606391 - 2⁶ = 40606327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40606361) 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, 40355 + ... + 41348.

It is an arithmetic number, because the mean of its divisors is an integer number (5882688).

Almost surely, 2^40606391 is an apocalyptic number.

40606391 is a deficient number, since it is larger than the sum of its proper divisors (6455113).

40606391 is an equidigital number, since it uses as much as digits as its factorization.

40606391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81781.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 40606391 is about 6372.3144147162. The cubic root of 40606391 is about 343.7147192000.

Adding to 40606391 its reverse (19360604), we get a palindrome (59966995).

The spelling of 40606391 in words is "forty million, six hundred six thousand, three hundred ninety-one".