1391390924 has 48 divisors (see below), whose sum is σ = 3109833216. Its totient is φ = 528873600.

The previous prime is 1391390921. The next prime is 1391390941. The reversal of 1391390924 is 4290931931.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (1391390921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42464 + ... + 67719.

It is an arithmetic number, because the mean of its divisors is an integer number (64788192).

Almost surely, 2^1391390924 is an apocalyptic number.

1391390924 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1391390924 is an abundant number, since it is smaller than the sum of its proper divisors (1718442292).

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

1391390924 is a wasteful number, since it uses less digits than its factorization.

1391390924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110246 (or 110244 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 1391390924 is about 37301.3528440994. The cubic root of 1391390924 is about 1116.3911594567.

The spelling of 1391390924 in words is "one billion, three hundred ninety-one million, three hundred ninety thousand, nine hundred twenty-four".