381603780 has 36 divisors (see below), whose sum is σ = 1157532012. Its totient is φ = 101760960.

The previous prime is 381603713. The next prime is 381603791. The reversal of 381603780 is 87306183.

It can be written as a sum of positive squares in 2 ways, for example, as 85488516 + 296115264 = 9246^2 + 17208^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1059831 + ... + 1060190.

It is an arithmetic number, because the mean of its divisors is an integer number (32153667).

Almost surely, 2^381603780 is an apocalyptic number.

381603780 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

381603780 is an abundant number, since it is smaller than the sum of its proper divisors (775928232).

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

381603780 is a wasteful number, since it uses less digits than its factorization.

381603780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2120036 (or 2120031 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 381603780 is about 19534.6814665610. The cubic root of 381603780 is about 725.3331992015. Note that the first 3 decimals are identical.

The spelling of 381603780 in words is "three hundred eighty-one million, six hundred three thousand, seven hundred eighty".