40309438 has 8 divisors (see below), whose sum is σ = 65115288. Its totient is φ = 18604344.

The previous prime is 40309433. The next prime is 40309439. The reversal of 40309438 is 83490304.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40309433) 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, 775156 + ... + 775207.

It is an arithmetic number, because the mean of its divisors is an integer number (8139411).

Almost surely, 2^40309438 is an apocalyptic number.

40309438 is a deficient number, since it is larger than the sum of its proper divisors (24805850).

40309438 is a wasteful number, since it uses less digits than its factorization.

40309438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550378.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 40309438 is about 6348.9714127566. The cubic root of 40309438 is about 342.8748108785.

The spelling of 40309438 in words is "forty million, three hundred nine thousand, four hundred thirty-eight".