381987701 has 4 divisors (see below), whose sum is σ = 382130304. Its totient is φ = 381845100.

The previous prime is 381987643. The next prime is 381987713. The reversal of 381987701 is 107789183.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381987701 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381987401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67205 + ... + 72666.

It is an arithmetic number, because the mean of its divisors is an integer number (95532576).

Almost surely, 2^381987701 is an apocalyptic number.

It is an amenable number.

381987701 is a deficient number, since it is larger than the sum of its proper divisors (142603).

381987701 is a wasteful number, since it uses less digits than its factorization.

381987701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142602.

The product of its (nonzero) digits is 84672, while the sum is 44.

The square root of 381987701 is about 19544.5056473680. The cubic root of 381987701 is about 725.5763635574.

The spelling of 381987701 in words is "three hundred eighty-one million, nine hundred eighty-seven thousand, seven hundred one".