3909521940 has 48 divisors (see below), whose sum is σ = 10998576960. Its totient is φ = 1037594880.

The previous prime is 3909521887. The next prime is 3909521951. The reversal of 3909521940 is 491259093.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 3909521892 and 3909521901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141745 + ... + 167064.

It is an arithmetic number, because the mean of its divisors is an integer number (229137020).

Almost surely, 2^3909521940 is an apocalyptic number.

3909521940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3909521940 is an abundant number, since it is smaller than the sum of its proper divisors (7089055020).

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

3909521940 is a wasteful number, since it uses less digits than its factorization.

3909521940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309032 (or 309030 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 42.

The square root of 3909521940 is about 62526.1700410316. The cubic root of 3909521940 is about 1575.3409108350.

The spelling of 3909521940 in words is "three billion, nine hundred nine million, five hundred twenty-one thousand, nine hundred forty".