977421 has 4 divisors (see below), whose sum is σ = 1303232. Its totient is φ = 651612.

The previous prime is 977413. The next prime is 977437. The reversal of 977421 is 124779.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124779 = 3 ⋅41593.

It is not a de Polignac number, because 977421 - 2³ = 977413 is a prime.

It is a super-2 number, since 2×977421² = 1910703622482, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (977411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162901 + ... + 162906.

It is an arithmetic number, because the mean of its divisors is an integer number (325808).

2⁹⁷⁷⁴²¹ is an apocalyptic number.

It is an amenable number.

977421 is a deficient number, since it is larger than the sum of its proper divisors (325811).

977421 is a wasteful number, since it uses less digits than its factorization.

977421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325810.

The product of its digits is 3528, while the sum is 30.

The square root of 977421 is about 988.6460438398. The cubic root of 977421 is about 99.2416299540.

The spelling of 977421 in words is "nine hundred seventy-seven thousand, four hundred twenty-one".