40045420 has 24 divisors (see below), whose sum is σ = 85282848. Its totient is φ = 15792000.

The previous prime is 40045409. The next prime is 40045441. The reversal of 40045420 is 2454004.

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, 12681 + ... + 15520.

It is an arithmetic number, because the mean of its divisors is an integer number (3553452).

Almost surely, 2^40045420 is an apocalyptic number.

It is an amenable number.

40045420 is an abundant number, since it is smaller than the sum of its proper divisors (45237428).

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

40045420 is a wasteful number, since it uses less digits than its factorization.

40045420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28281 (or 28279 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 40045420 is about 6328.1450678694. The cubic root of 40045420 is about 342.1245855504.

Adding to 40045420 its reverse (2454004), we get a palindrome (42499424).

The spelling of 40045420 in words is "forty million, forty-five thousand, four hundred twenty".