381367987 has 64 divisors (see below), whose sum is σ = 551384064. Its totient is φ = 253808640.

The previous prime is 381367969. The next prime is 381367993. The reversal of 381367987 is 789763183.

It is a happy number.

It is not a de Polignac number, because 381367987 - 2¹¹ = 381365939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381367907) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1242088 + ... + 1242394.

It is an arithmetic number, because the mean of its divisors is an integer number (8615376).

Almost surely, 2^381367987 is an apocalyptic number.

381367987 is a deficient number, since it is larger than the sum of its proper divisors (170016077).

381367987 is a wasteful number, since it uses less digits than its factorization.

381367987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428.

The product of its digits is 1524096, while the sum is 52.

The square root of 381367987 is about 19528.6452935169. The cubic root of 381367987 is about 725.1837739439.

The spelling of 381367987 in words is "three hundred eighty-one million, three hundred sixty-seven thousand, nine hundred eighty-seven".