3926492640 has 144 divisors (see below), whose sum is σ = 15313360608. Its totient is φ = 897481728.

The previous prime is 3926492621. The next prime is 3926492641. The reversal of 3926492640 is 462946293.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3926492641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 184687 + ... + 204846.

It is an arithmetic number, because the mean of its divisors is an integer number (106342782).

Almost surely, 2^3926492640 is an apocalyptic number.

3926492640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3926492640 is an abundant number, since it is smaller than the sum of its proper divisors (11386867968).

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

3926492640 is a wasteful number, since it uses less digits than its factorization.

3926492640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389561 (or 389550 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 45.

The square root of 3926492640 is about 62661.7318624374. The cubic root of 3926492640 is about 1577.6170669843.

The spelling of 3926492640 in words is "three billion, nine hundred twenty-six million, four hundred ninety-two thousand, six hundred forty".