40302540 has 36 divisors (see below), whose sum is σ = 122251584. Its totient is φ = 10747296.

The previous prime is 40302533. The next prime is 40302541. The reversal of 40302540 is 4520304.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (40302541) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111772 + ... + 112131.

Almost surely, 2^40302540 is an apocalyptic number.

It is an amenable number.

40302540 is an abundant number, since it is smaller than the sum of its proper divisors (81949044).

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

40302540 is a wasteful number, since it uses less digits than its factorization.

40302540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223918 (or 223913 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 40302540 is about 6348.4281519129. The cubic root of 40302540 is about 342.8552514777.

Adding to 40302540 its reverse (4520304), we get a palindrome (44822844).

The spelling of 40302540 in words is "forty million, three hundred two thousand, five hundred forty".