40145989 has 8 divisors (see below), whose sum is σ = 43337952. Its totient is φ = 36968880.

The previous prime is 40145977. The next prime is 40146013. The reversal of 40145989 is 98954104.

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

It is not a de Polignac number, because 40145989 - 2⁹ = 40145477 is a prime.

It is a super-2 number, since 2×40145989² = 3223400865576242, 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 (40145969) 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, 2274 + ... + 9244.

It is an arithmetic number, because the mean of its divisors is an integer number (5417244).

Almost surely, 2^40145989 is an apocalyptic number.

It is an amenable number.

40145989 is a deficient number, since it is larger than the sum of its proper divisors (3191963).

40145989 is a wasteful number, since it uses less digits than its factorization.

40145989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7427.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 40145989 is about 6336.0862525695. The cubic root of 40145989 is about 342.4107469850.

The spelling of 40145989 in words is "forty million, one hundred forty-five thousand, nine hundred eighty-nine".