1391444920400 has 120 divisors (see below), whose sum is σ = 3540601690560. Its totient is φ = 523688417280.

The previous prime is 1391444920399. The next prime is 1391444920409. The reversal of 1391444920400 is 40294441931.

It is a super-2 number, since 2×1391444920400² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391444920409) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25397837 + ... + 25452563.

It is an arithmetic number, because the mean of its divisors is an integer number (29505014088).

Almost surely, 2^{1391444920400} is an apocalyptic number.

1391444920400 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 1391444920400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1770300845280).

1391444920400 is an abundant number, since it is smaller than the sum of its proper divisors (2149156770160).

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

1391444920400 is a wasteful number, since it uses less digits than its factorization.

1391444920400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58501 (or 58490 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 1391444920400 in words is "one trillion, three hundred ninety-one billion, four hundred forty-four million, nine hundred twenty thousand, four hundred".