1381609344 has 32 divisors (see below), whose sum is σ = 3669900840. Its totient is φ = 460536320.

The previous prime is 1381609337. The next prime is 1381609373. The reversal of 1381609344 is 4439061831.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×1381609344² = 3817688758856220672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1798587 + ... + 1799354.

Almost surely, 2^1381609344 is an apocalyptic number.

It is an amenable number.

1381609344 is an abundant number, since it is smaller than the sum of its proper divisors (2288291496).

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

1381609344 is an equidigital number, since it uses as much as digits as its factorization.

1381609344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3597958 (or 3597946 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 1381609344 is about 37170.0059725580. The cubic root of 1381609344 is about 1113.7689010889.

It can be divided in two parts, 1381609 and 344, that added together give a triangular number (1381953 = T₁₆₆₂).

The spelling of 1381609344 in words is "one billion, three hundred eighty-one million, six hundred nine thousand, three hundred forty-four".