40842945 has 72 divisors (see below), whose sum is σ = 83946408. Its totient is φ = 18247680.

The previous prime is 40842887. The next prime is 40842947. The reversal of 40842945 is 54924804.

It can be written as a sum of positive squares in 4 ways, for example, as 8625969 + 32216976 = 2937^2 + 5676^2 .

It is not a de Polignac number, because 40842945 - 2⁶ = 40842881 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40842947) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 70497 + ... + 71073.

Almost surely, 2^40842945 is an apocalyptic number.

40842945 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40842945 is an abundant number, since it is smaller than the sum of its proper divisors (43103463).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40842945 is a wasteful number, since it uses less digits than its factorization.

40842945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623 (or 609 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 40842945 is about 6390.8485352103. The cubic root of 40842945 is about 344.3808681558.

The spelling of 40842945 in words is "forty million, eight hundred forty-two thousand, nine hundred forty-five".