40212309 has 8 divisors (see below), whose sum is σ = 53708032. Its totient is φ = 26762400.

The previous prime is 40212281. The next prime is 40212313. The reversal of 40212309 is 90321204.

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-40212309 is a prime.

It is a super-2 number, since 2×40212309² = 3234059590222962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40212329) 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, 9349 + ... + 12954.

It is an arithmetic number, because the mean of its divisors is an integer number (6713504).

Almost surely, 2^40212309 is an apocalyptic number.

It is an amenable number.

40212309 is a deficient number, since it is larger than the sum of its proper divisors (13495723).

40212309 is a wasteful number, since it uses less digits than its factorization.

40212309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22907.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 40212309 is about 6341.3176075639. The cubic root of 40212309 is about 342.5991941008.

The spelling of 40212309 in words is "forty million, two hundred twelve thousand, three hundred nine".