1340225381 has 4 divisors (see below), whose sum is σ = 1462064064. Its totient is φ = 1218386700.

The previous prime is 1340225353. The next prime is 1340225423. The reversal of 1340225381 is 1835220431.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1340225381 is a prime.

It is a super-2 number, since 2×1340225381² = 3592408143753190322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340224381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60919325 + ... + 60919346.

It is an arithmetic number, because the mean of its divisors is an integer number (365516016).

Almost surely, 2^1340225381 is an apocalyptic number.

1340225381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1340225381 is a deficient number, since it is larger than the sum of its proper divisors (121838683).

1340225381 is a wasteful number, since it uses less digits than its factorization.

1340225381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121838682.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 1340225381 is about 36609.0887758764. The cubic root of 1340225381 is about 1102.5355780944.

It can be divided in two parts, 13402 and 25381, that added together give a palindrome (38783).

The spelling of 1340225381 in words is "one billion, three hundred forty million, two hundred twenty-five thousand, three hundred eighty-one".