40207440 has 240 divisors, whose sum is σ = 156739968. Its totient is φ = 8451072.

The previous prime is 40207423. The next prime is 40207469. The reversal of 40207440 is 4470204.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 152749 + ... + 153011.

Almost surely, 2^40207440 is an apocalyptic number.

40207440 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 40207440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78369984).

40207440 is an abundant number, since it is smaller than the sum of its proper divisors (116532528).

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

40207440 is a wasteful number, since it uses less digits than its factorization.

40207440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 21.

The square root of 40207440 is about 6340.9336851918. The cubic root of 40207440 is about 342.5853659733.

Adding to 40207440 its reverse (4470204), we get a palindrome (44677644).

The spelling of 40207440 in words is "forty million, two hundred seven thousand, four hundred forty".