1401291220 has 36 divisors (see below), whose sum is σ = 3423156660. Its totient is φ = 480442368.

The previous prime is 1401291193. The next prime is 1401291239. The reversal of 1401291220 is 221921041.

It can be written as a sum of positive squares in 2 ways, for example, as 1026946116 + 374345104 = 32046^2 + 19348^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1401291191 and 1401291200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 713965 + ... + 715924.

It is an arithmetic number, because the mean of its divisors is an integer number (95087685).

Almost surely, 2^1401291220 is an apocalyptic number.

1401291220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1401291220 is an abundant number, since it is smaller than the sum of its proper divisors (2021865440).

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

1401291220 is a wasteful number, since it uses less digits than its factorization.

1401291220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429912 (or 1429903 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1401291220 is about 37433.8245441205. The cubic root of 1401291220 is about 1119.0327586728.

The spelling of 1401291220 in words is "one billion, four hundred one million, two hundred ninety-one thousand, two hundred twenty".