1381615890 has 32 divisors (see below), whose sum is σ = 3405499200. Its totient is φ = 358473024.

The previous prime is 1381615889. The next prime is 1381615903. The reversal of 1381615890 is 985161831.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 621240 + ... + 623459.

It is an arithmetic number, because the mean of its divisors is an integer number (106421850).

Almost surely, 2^1381615890 is an apocalyptic number.

1381615890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1381615890 is an abundant number, since it is smaller than the sum of its proper divisors (2023883310).

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

1381615890 is a wasteful number, since it uses less digits than its factorization.

1381615890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244746.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 1381615890 is about 37170.0940273226. The cubic root of 1381615890 is about 1113.7706600810.

The spelling of 1381615890 in words is "one billion, three hundred eighty-one million, six hundred fifteen thousand, eight hundred ninety".