1381942890 has 32 divisors (see below), whose sum is σ = 3685181760. Its totient is φ = 368518032.

The previous prime is 1381942853. The next prime is 1381942897. The reversal of 1381942890 is 982491831.

1381942890 is a `hidden beast` number, since 138 + 1 + 9 + 428 + 90 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1381942897) 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, 2558884 + ... + 2559423.

It is an arithmetic number, because the mean of its divisors is an integer number (115161930).

Almost surely, 2^1381942890 is an apocalyptic number.

1381942890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1381942890 is an abundant number, since it is smaller than the sum of its proper divisors (2303238870).

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

1381942890 is a wasteful number, since it uses less digits than its factorization.

1381942890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5118323 (or 5118317 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 1381942890 is about 37174.4924645919. The cubic root of 1381942890 is about 1113.8585220015.

The spelling of 1381942890 in words is "one billion, three hundred eighty-one million, nine hundred forty-two thousand, eight hundred ninety".