40138061280 has 48 divisors (see below), whose sum is σ = 126434894544. Its totient is φ = 10703482880.

The previous prime is 40138061269. The next prime is 40138061303. The reversal of 40138061280 is 8216083104.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×40138061280² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41810001 + ... + 41810960.

It is an arithmetic number, because the mean of its divisors is an integer number (2634060303).

Almost surely, 2^40138061280 is an apocalyptic number.

40138061280 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

40138061280 is an abundant number, since it is smaller than the sum of its proper divisors (86296833264).

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

40138061280 is a wasteful number, since it uses less digits than its factorization.

40138061280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83620979 (or 83620971 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The spelling of 40138061280 in words is "forty billion, one hundred thirty-eight million, sixty-one thousand, two hundred eighty".