40400240 has 40 divisors (see below), whose sum is σ = 94264800. Its totient is φ = 16102656.

The previous prime is 40400237. The next prime is 40400249. The reversal of 40400240 is 4200404.

40400240 = T₂₉₆ + T₂₉₇ + ... + T₆₄₄.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40400249) 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, 27197 + ... + 28643.

It is an arithmetic number, because the mean of its divisors is an integer number (2356620).

Almost surely, 2^40400240 is an apocalyptic number.

40400240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40400240 is an abundant number, since it is smaller than the sum of its proper divisors (53864560).

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

40400240 is a wasteful number, since it uses less digits than its factorization.

40400240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809 (or 1803 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 40400240 is about 6356.1183123035. The cubic root of 40400240 is about 343.1320737911.

Adding to 40400240 its reverse (4200404), we get a palindrome (44600644).

The spelling of 40400240 in words is "forty million, four hundred thousand, two hundred forty".