40389890 has 8 divisors (see below), whose sum is σ = 72701820. Its totient is φ = 16155952.

The previous prime is 40389889. The next prime is 40389893. The reversal of 40389890 is 9898304.

It can be written as a sum of positive squares in 2 ways, for example, as 40309801 + 80089 = 6349^2 + 283^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40389893) 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, 2019485 + ... + 2019504.

Almost surely, 2^40389890 is an apocalyptic number.

40389890 is a deficient number, since it is larger than the sum of its proper divisors (32311930).

40389890 is a wasteful number, since it uses less digits than its factorization.

40389890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4038996.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 40389890 is about 6355.3040839916. The cubic root of 40389890 is about 343.1027693424.

The spelling of 40389890 in words is "forty million, three hundred eighty-nine thousand, eight hundred ninety".