1331400420 has 72 divisors (see below), whose sum is σ = 4615525824. Its totient is φ = 304319808.

The previous prime is 1331400419. The next prime is 1331400479. The reversal of 1331400420 is 240041331.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1331400393 and 1331400402.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 527074 + ... + 529593.

Almost surely, 2^1331400420 is an apocalyptic number.

1331400420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331400420 is an abundant number, since it is smaller than the sum of its proper divisors (3284125404).

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

1331400420 is a wasteful number, since it uses less digits than its factorization.

1331400420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056689 (or 1056684 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1331400420 is about 36488.3600618060. The cubic root of 1331400420 is about 1100.1102974800.

Adding to 1331400420 its reverse (240041331), we get a palindrome (1571441751).

The spelling of 1331400420 in words is "one billion, three hundred thirty-one million, four hundred thousand, four hundred twenty".