40642240 has 112 divisors (see below), whose sum is σ = 106216704. Its totient is φ = 14745600.

The previous prime is 40642229. The next prime is 40642247. The reversal of 40642240 is 4224604.

It is not an unprimeable number, because it can be changed into a prime (40642247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168520 + ... + 168760.

Almost surely, 2^40642240 is an apocalyptic number.

40642240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40642240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53108352).

40642240 is an abundant number, since it is smaller than the sum of its proper divisors (65574464).

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

40642240 is a wasteful number, since it uses less digits than its factorization.

40642240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306 (or 296 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 40642240 is about 6375.1266654083. The cubic root of 40642240 is about 343.8158379679.

Adding to 40642240 its reverse (4224604), we get a palindrome (44866844).

The spelling of 40642240 in words is "forty million, six hundred forty-two thousand, two hundred forty".