40039145 has 4 divisors (see below), whose sum is σ = 48046980. Its totient is φ = 32031312.

The previous prime is 40039093. The next prime is 40039147. The reversal of 40039145 is 54193004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26081449 + 13957696 = 5107^2 + 3736^2 .

It is a cyclic number.

It is not a de Polignac number, because 40039145 - 2¹² = 40035049 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40039147) 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, 4003910 + ... + 4003919.

It is an arithmetic number, because the mean of its divisors is an integer number (12011745).

Almost surely, 2^40039145 is an apocalyptic number.

It is an amenable number.

40039145 is a deficient number, since it is larger than the sum of its proper divisors (8007835).

40039145 is an equidigital number, since it uses as much as digits as its factorization.

40039145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8007834.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 40039145 is about 6327.6492475484. The cubic root of 40039145 is about 342.1067146435.

The spelling of 40039145 in words is "forty million, thirty-nine thousand, one hundred forty-five".