381797642 has 4 divisors (see below), whose sum is σ = 572696466. Its totient is φ = 190898820.

The previous prime is 381797641. The next prime is 381797651. The reversal of 381797642 is 246797183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 246797183 = 12479 ⋅19777.

It can be written as a sum of positive squares in only one way, i.e., 351975121 + 29822521 = 18761^2 + 5461^2 .

It is not an unprimeable number, because it can be changed into a prime (381797641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95449409 + ... + 95449412.

Almost surely, 2^381797642 is an apocalyptic number.

381797642 is a deficient number, since it is larger than the sum of its proper divisors (190898824).

381797642 is a wasteful number, since it uses less digits than its factorization.

381797642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190898823.

The product of its digits is 508032, while the sum is 47.

The square root of 381797642 is about 19539.6428319455. The cubic root of 381797642 is about 725.4560061084.

The spelling of 381797642 in words is "three hundred eighty-one million, seven hundred ninety-seven thousand, six hundred forty-two".