40209406 has 4 divisors (see below), whose sum is σ = 60314112. Its totient is φ = 20104702.

The previous prime is 40209401. The next prime is 40209409. The reversal of 40209406 is 60490204.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40209401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10052350 + ... + 10052353.

It is an arithmetic number, because the mean of its divisors is an integer number (15078528).

Almost surely, 2^40209406 is an apocalyptic number.

40209406 is a deficient number, since it is larger than the sum of its proper divisors (20104706).

40209406 is a wasteful number, since it uses less digits than its factorization.

40209406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20104705.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 40209406 is about 6341.0887077851. The cubic root of 40209406 is about 342.5909496153.

The spelling of 40209406 in words is "forty million, two hundred nine thousand, four hundred six".