956421 has 8 divisors (see below), whose sum is σ = 1416960. Its totient is φ = 637596.

The previous prime is 956401. The next prime is 956429. The reversal of 956421 is 124659.

It is not a de Polignac number, because 956421 - 2⁶ = 956357 is a prime.

It is a super-2 number, since 2×956421² = 1829482258482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 35423 = 956421 / (9 + 5 + 6 + 4 + 2 + 1).

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 956421.

It is not an unprimeable number, because it can be changed into a prime (956429) 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, 17685 + ... + 17738.

It is an arithmetic number, because the mean of its divisors is an integer number (177120).

2⁹⁵⁶⁴²¹ is an apocalyptic number.

It is an amenable number.

956421 is a deficient number, since it is larger than the sum of its proper divisors (460539).

956421 is a wasteful number, since it uses less digits than its factorization.

956421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35432 (or 35426 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 956421 is about 977.9677908807. The cubic root of 956421 is about 98.5257390198.

The spelling of 956421 in words is "nine hundred fifty-six thousand, four hundred twenty-one".