1956395421 has 12 divisors (see below), whose sum is σ = 2861676480. Its totient is φ = 1287753480.

The previous prime is 1956395417. The next prime is 1956395429. The reversal of 1956395421 is 1245936591.

1956395421 is a `hidden beast` number, since 1 + 9 + 5 + 639 + 5 + 4 + 2 + 1 = 666.

It is not a de Polignac number, because 1956395421 - 2² = 1956395417 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1956395429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1375095 + ... + 1376516.

It is an arithmetic number, because the mean of its divisors is an integer number (238473040).

Almost surely, 2^1956395421 is an apocalyptic number.

It is an amenable number.

1956395421 is a deficient number, since it is larger than the sum of its proper divisors (905281059).

1956395421 is a wasteful number, since it uses less digits than its factorization.

1956395421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2751696 (or 2751693 counting only the distinct ones).

The product of its digits is 291600, while the sum is 45.

The square root of 1956395421 is about 44231.1589380156. The cubic root of 1956395421 is about 1250.6973007583.

The spelling of 1956395421 in words is "one billion, nine hundred fifty-six million, three hundred ninety-five thousand, four hundred twenty-one".