3940121520 has 120 divisors (see below), whose sum is σ = 13320239712. Its totient is φ = 1043712000.

The previous prime is 3940121509. The next prime is 3940121567. The reversal of 3940121520 is 251210493.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×3940121520² = 31049115184734220800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90600 + ... + 126840.

Almost surely, 2^3940121520 is an apocalyptic number.

3940121520 is a gapful number since it is divisible by the number (30) 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 3940121520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6660119856).

3940121520 is an abundant number, since it is smaller than the sum of its proper divisors (9380118192).

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

3940121520 is a wasteful number, since it uses less digits than its factorization.

3940121520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36411 (or 36402 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 3940121520 is about 62770.3872857257. The cubic root of 3940121520 is about 1579.4402653314.

The spelling of 3940121520 in words is "three billion, nine hundred forty million, one hundred twenty-one thousand, five hundred twenty".