1391389240 has 32 divisors (see below), whose sum is σ = 3132833760. Its totient is φ = 556163200.

The previous prime is 1391389217. The next prime is 1391389253. The reversal of 1391389240 is 429831931.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 1391389193 and 1391389202.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 48930 + ... + 71950.

It is an arithmetic number, because the mean of its divisors is an integer number (97901055).

Almost surely, 2^1391389240 is an apocalyptic number.

1391389240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1391389240 is an abundant number, since it is smaller than the sum of its proper divisors (1741444520).

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

1391389240 is a wasteful number, since it uses less digits than its factorization.

1391389240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24543 (or 24539 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 1391389240 is about 37301.3302711847. The cubic root of 1391389240 is about 1116.3907090673.

The spelling of 1391389240 in words is "one billion, three hundred ninety-one million, three hundred eighty-nine thousand, two hundred forty".