1391439700 has 72 divisors (see below), whose sum is σ = 3524274432. Its totient is φ = 466903680.

The previous prime is 1391439697. The next prime is 1391439757. The reversal of 1391439700 is 79341931.

It is a super-2 number, since 2×1391439700² = 3872208877472180000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1391439700.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11754 + ... + 54046.

It is an arithmetic number, because the mean of its divisors is an integer number (48948256).

Almost surely, 2^1391439700 is an apocalyptic number.

1391439700 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 1391439700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1762137216).

1391439700 is an abundant number, since it is smaller than the sum of its proper divisors (2132834732).

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

1391439700 is a wasteful number, since it uses less digits than its factorization.

1391439700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42361 (or 42354 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 1391439700 is about 37302.0066484365. The cubic root of 1391439700 is about 1116.4042045466.

The spelling of 1391439700 in words is "one billion, three hundred ninety-one million, four hundred thirty-nine thousand, seven hundred".