1521967 has 4 divisors (see below), whose sum is σ = 1536040. Its totient is φ = 1507896.

The previous prime is 1521937. The next prime is 1521973. The reversal of 1521967 is 7691251.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1521967 - 2¹⁵ = 1489199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1521937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6873 + ... + 7090.

It is an arithmetic number, because the mean of its divisors is an integer number (384010).

2^1521967 is an apocalyptic number.

1521967 is a deficient number, since it is larger than the sum of its proper divisors (14073).

1521967 is a wasteful number, since it uses less digits than its factorization.

1521967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14072.

The product of its digits is 3780, while the sum is 31.

The square root of 1521967 is about 1233.6802665197. The cubic root of 1521967 is about 115.0275170447.

The spelling of 1521967 in words is "one million, five hundred twenty-one thousand, nine hundred sixty-seven".