40265537920 has 128 divisors (see below), whose sum is σ = 99982586880. Its totient is φ = 15489792000.

The previous prime is 40265537911. The next prime is 40265537927. The reversal of 40265537920 is 2973556204.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-4 number, since 4×40265537920⁴ (a number of 44 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40265537927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3227695 + ... + 3240145.

It is an arithmetic number, because the mean of its divisors is an integer number (781113960).

Almost surely, 2^40265537920 is an apocalyptic number.

40265537920 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 40265537920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49991293440).

40265537920 is an abundant number, since it is smaller than the sum of its proper divisors (59717048960).

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

40265537920 is a wasteful number, since it uses less digits than its factorization.

40265537920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12664 (or 12652 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 43.

The spelling of 40265537920 in words is "forty billion, two hundred sixty-five million, five hundred thirty-seven thousand, nine hundred twenty".