40640145 has 64 divisors (see below), whose sum is σ = 84295680. Its totient is φ = 16236288.

The previous prime is 40640137. The next prime is 40640153. The reversal of 40640145 is 54104604.

40640145 = 400² + 401² + ... + 570².

It is an interprime number because it is at equal distance from previous prime (40640137) and next prime (40640153).

It is not a de Polignac number, because 40640145 - 2³ = 40640137 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25152 + ... + 26718.

It is an arithmetic number, because the mean of its divisors is an integer number (1317120).

Almost surely, 2^40640145 is an apocalyptic number.

It is an amenable number.

40640145 is an abundant number, since it is smaller than the sum of its proper divisors (43655535).

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

40640145 is a wasteful number, since it uses less digits than its factorization.

40640145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1614.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 40640145 is about 6374.9623528300. The cubic root of 40640145 is about 343.8099302672.

Adding to 40640145 its reverse (54104604), we get a palindrome (94744749).

The spelling of 40640145 in words is "forty million, six hundred forty thousand, one hundred forty-five".