40369409 has 4 divisors (see below), whose sum is σ = 41671680. Its totient is φ = 39067140.

The previous prime is 40369367. The next prime is 40369423. The reversal of 40369409 is 90496304.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40369409 - 2¹² = 40365313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40369429) 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, 651089 + ... + 651150.

It is an arithmetic number, because the mean of its divisors is an integer number (10417920).

Almost surely, 2^40369409 is an apocalyptic number.

It is an amenable number.

40369409 is a deficient number, since it is larger than the sum of its proper divisors (1302271).

40369409 is a wasteful number, since it uses less digits than its factorization.

40369409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302270.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 40369409 is about 6353.6925484320. The cubic root of 40369409 is about 343.0447657519.

The spelling of 40369409 in words is "forty million, three hundred sixty-nine thousand, four hundred nine".