1391243200 has 84 divisors (see below), whose sum is σ = 3430764792. Its totient is φ = 555289600.

The previous prime is 1391243197. The next prime is 1391243209. The reversal of 1391243200 is 23421931.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391243209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1274655 + ... + 1275745.

It is an arithmetic number, because the mean of its divisors is an integer number (40842438).

Almost surely, 2^1391243200 is an apocalyptic number.

1391243200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1391243200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1715382396).

1391243200 is an abundant number, since it is smaller than the sum of its proper divisors (2039521592).

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

1391243200 is a wasteful number, since it uses less digits than its factorization.

1391243200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910 (or 1895 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1391243200 is about 37299.3726488798. The cubic root of 1391243200 is about 1116.3516489684.

The spelling of 1391243200 in words is "one billion, three hundred ninety-one million, two hundred forty-three thousand, two hundred".