1913969640 has 64 divisors (see below), whose sum is σ = 6263904960. Its totient is φ = 463992320.

The previous prime is 1913969639. The next prime is 1913969641. The reversal of 1913969640 is 469693191.

1913969640 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (1913969639) and next prime (1913969641).

It is a self number, because there is not a number n which added to its sum of digits gives 1913969640.

It is not an unprimeable number, because it can be changed into a prime (1913969641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 723669 + ... + 726308.

It is an arithmetic number, because the mean of its divisors is an integer number (97873515).

Almost surely, 2^1913969640 is an apocalyptic number.

1913969640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1913969640 is an abundant number, since it is smaller than the sum of its proper divisors (4349935320).

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

1913969640 is a wasteful number, since it uses less digits than its factorization.

1913969640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1450002 (or 1449998 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 48.

The square root of 1913969640 is about 43748.9387299852. The cubic root of 1913969640 is about 1241.5904063990.

The spelling of 1913969640 in words is "one billion, nine hundred thirteen million, nine hundred sixty-nine thousand, six hundred forty".