1987257 has 8 divisors (see below), whose sum is σ = 2661984. Its totient is φ = 1318688.

The previous prime is 1987247. The next prime is 1987261. The reversal of 1987257 is 7527891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1987257 - 2⁴ = 1987241 is a prime.

1987257 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 723 + ... + 2120.

It is an arithmetic number, because the mean of its divisors is an integer number (332748).

2^1987257 is an apocalyptic number.

It is an amenable number.

1987257 is a deficient number, since it is larger than the sum of its proper divisors (674727).

1987257 is a wasteful number, since it uses less digits than its factorization.

1987257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3079.

The product of its digits is 35280, while the sum is 39.

The square root of 1987257 is about 1409.7010321341. The cubic root of 1987257 is about 125.7239484284.

The spelling of 1987257 in words is "one million, nine hundred eighty-seven thousand, two hundred fifty-seven".