40245140 has 24 divisors (see below), whose sum is σ = 91016520. Its totient is φ = 14859648.

The previous prime is 40245133. The next prime is 40245181. The reversal of 40245140 is 4154204.

It can be written as a sum of positive squares in 4 ways, for example, as 3254416 + 36990724 = 1804^2 + 6082^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77135 + ... + 77654.

It is an arithmetic number, because the mean of its divisors is an integer number (3792355).

Almost surely, 2^40245140 is an apocalyptic number.

It is an amenable number.

40245140 is an abundant number, since it is smaller than the sum of its proper divisors (50771380).

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

40245140 is a wasteful number, since it uses less digits than its factorization.

40245140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154811 (or 154809 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 40245140 is about 6343.9057370046. The cubic root of 40245140 is about 342.6924061440.

Adding to 40245140 its reverse (4154204), we get a palindrome (44399344).

The spelling of 40245140 in words is "forty million, two hundred forty-five thousand, one hundred forty".