40205040 has 40 divisors (see below), whose sum is σ = 124636368. Its totient is φ = 10721280.

The previous prime is 40205029. The next prime is 40205041. The reversal of 40205040 is 4050204.

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

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40205041) 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, 83521 + ... + 84000.

Almost surely, 2^40205040 is an apocalyptic number.

40205040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40205040 is an abundant number, since it is smaller than the sum of its proper divisors (84431328).

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

40205040 is a wasteful number, since it uses less digits than its factorization.

40205040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167537 (or 167531 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 40205040 is about 6340.7444357899. The cubic root of 40205040 is about 342.5785494800.

Adding to 40205040 its reverse (4050204), we get a palindrome (44255244).

The spelling of 40205040 in words is "forty million, two hundred five thousand, forty".