1381420188 has 18 divisors (see below), whose sum is σ = 3491923344. Its totient is φ = 460473384.

The previous prime is 1381420129. The next prime is 1381420189. The reversal of 1381420188 is 8810241831.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 38372783 = 1381420188 / (1 + 3 + 8 + 1 + 4 + 2 + 0 + 1 + 8 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381420189) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19186356 + ... + 19186427.

Almost surely, 2^1381420188 is an apocalyptic number.

1381420188 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1381420188 is an abundant number, since it is smaller than the sum of its proper divisors (2110503156).

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

1381420188 is a wasteful number, since it uses less digits than its factorization.

1381420188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38372793 (or 38372788 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 1381420188 is about 37167.4614145222. The cubic root of 1381420188 is about 1113.7180701053.

The spelling of 1381420188 in words is "one billion, three hundred eighty-one million, four hundred twenty thousand, one hundred eighty-eight".