16149987 has 12 divisors (see below), whose sum is σ = 26660400. Its totient is φ = 9228528.

The previous prime is 16149901. The next prime is 16149989. The reversal of 16149987 is 78994161.

It is a happy number.

It is not a de Polignac number, because 16149987 - 2¹¹ = 16147939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16149989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 128112 + ... + 128237.

It is an arithmetic number, because the mean of its divisors is an integer number (2221700).

Almost surely, 2^16149987 is an apocalyptic number.

16149987 is a deficient number, since it is larger than the sum of its proper divisors (10510413).

16149987 is a wasteful number, since it uses less digits than its factorization.

16149987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256362 (or 256359 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 16149987 is about 4018.7046420457. The cubic root of 16149987 is about 252.7691447664.

The spelling of 16149987 in words is "sixteen million, one hundred forty-nine thousand, nine hundred eighty-seven".