1977967 has 4 divisors (see below), whose sum is σ = 2094336. Its totient is φ = 1861600.

The previous prime is 1977961. The next prime is 1977971. The reversal of 1977967 is 7697791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7697791 = 41 ⋅187751.

It is a cyclic number.

It is not a de Polignac number, because 1977967 - 2¹⁵ = 1945199 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 (1977961) 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, 58159 + ... + 58192.

It is an arithmetic number, because the mean of its divisors is an integer number (523584).

2^1977967 is an apocalyptic number.

1977967 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1977967 is a deficient number, since it is larger than the sum of its proper divisors (116369).

1977967 is a wasteful number, since it uses less digits than its factorization.

1977967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116368.

The product of its digits is 166698, while the sum is 46.

The square root of 1977967 is about 1406.4021473249. The cubic root of 1977967 is about 125.5277315267.

The spelling of 1977967 in words is "one million, nine hundred seventy-seven thousand, nine hundred sixty-seven".