1491385790388 has 48 divisors (see below), whose sum is σ = 3770576188736. Its totient is φ = 456072664320.

The previous prime is 1491385790381. The next prime is 1491385790407. The reversal of 1491385790388 is 8830975831941.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1491385790381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29300233 + ... + 29351088.

Almost surely, 2^{1491385790388} is an apocalyptic number.

It is an amenable number.

1491385790388 is an abundant number, since it is smaller than the sum of its proper divisors (2279190398348).

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

1491385790388 is a wasteful number, since it uses less digits than its factorization.

1491385790388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58651504 (or 58651502 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 66.

The spelling of 1491385790388 in words is "one trillion, four hundred ninety-one billion, three hundred eighty-five million, seven hundred ninety thousand, three hundred eighty-eight".