1381463640 has 64 divisors (see below), whose sum is σ = 4604882400. Its totient is φ = 368390016.

The previous prime is 1381463591. The next prime is 1381463641. The reversal of 1381463640 is 463641831.

It is a happy number.

1381463640 is a `hidden beast` number, since 1 + 3 + 8 + 1 + 4 + 6 + 3 + 640 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1381463595 and 1381463604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381463641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 638487 + ... + 640646.

Almost surely, 2^1381463640 is an apocalyptic number.

1381463640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1381463640 is an abundant number, since it is smaller than the sum of its proper divisors (3223418760).

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

1381463640 is a wasteful number, since it uses less digits than its factorization.

1381463640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279153 (or 1279143 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 1381463640 is about 37168.0459534800. The cubic root of 1381463640 is about 1113.7297471631.

The spelling of 1381463640 in words is "one billion, three hundred eighty-one million, four hundred sixty-three thousand, six hundred forty".