40250640 has 40 divisors (see below), whose sum is σ = 124777728. Its totient is φ = 10733440.

The previous prime is 40250597. The next prime is 40250641. The reversal of 40250640 is 4605204.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×40250640² = 3240228040819200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40250641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83616 + ... + 84095.

Almost surely, 2^40250640 is an apocalyptic number.

40250640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40250640 is an abundant number, since it is smaller than the sum of its proper divisors (84527088).

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

40250640 is a wasteful number, since it uses less digits than its factorization.

40250640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167727 (or 167721 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 40250640 is about 6344.3392090903. The cubic root of 40250640 is about 342.7080164958.

Adding to 40250640 its reverse (4605204), we get a palindrome (44855844).

The spelling of 40250640 in words is "forty million, two hundred fifty thousand, six hundred forty".