1401780 has 48 divisors (see below), whose sum is σ = 3999744. Its totient is φ = 366720.

The previous prime is 1401767. The next prime is 1401791. The reversal of 1401780 is 871041.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3469 + ... + 3851.

It is an arithmetic number, because the mean of its divisors is an integer number (83328).

2^1401780 is an apocalyptic number.

1401780 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 1401780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1999872).

1401780 is an abundant number, since it is smaller than the sum of its proper divisors (2597964).

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

1401780 is a wasteful number, since it uses less digits than its factorization.

1401780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456 (or 454 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 1401780 is about 1183.9679049704. The cubic root of 1401780 is about 111.9162852318.

The spelling of 1401780 in words is "one million, four hundred one thousand, seven hundred eighty".