1331402240 has 80 divisors (see below), whose sum is σ = 3648328992. Its totient is φ = 456474624.

The previous prime is 1331402231. The next prime is 1331402279. The reversal of 1331402240 is 422041331.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19229 + ... + 55068.

Almost surely, 2^1331402240 is an apocalyptic number.

1331402240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331402240 is an abundant number, since it is smaller than the sum of its proper divisors (2316926752).

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

1331402240 is an frugal number, since it uses more digits than its factorization.

1331402240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74327 (or 74311 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1331402240 is about 36488.3850012576. The cubic root of 1331402240 is about 1100.1107987566.

Adding to 1331402240 its reverse (422041331), we get a palindrome (1753443571).

The spelling of 1331402240 in words is "one billion, three hundred thirty-one million, four hundred two thousand, two hundred forty".