40120640 has 56 divisors (see below), whose sum is σ = 109191552. Its totient is φ = 13754880.

The previous prime is 40120637. The next prime is 40120643. The reversal of 40120640 is 4602104.

It is an interprime number because it is at equal distance from previous prime (40120637) and next prime (40120643).

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40120643) 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, 6716 + ... + 11195.

Almost surely, 2^40120640 is an apocalyptic number.

40120640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40120640 is an abundant number, since it is smaller than the sum of its proper divisors (69070912).

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

40120640 is a wasteful number, since it uses less digits than its factorization.

40120640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17935 (or 17925 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 40120640 is about 6334.0855693620. The cubic root of 40120640 is about 342.3386634242.

Adding to 40120640 its reverse (4602104), we get a palindrome (44722744).

The spelling of 40120640 in words is "forty million, one hundred twenty thousand, six hundred forty".