3926421 has 8 divisors (see below), whose sum is σ = 5816960. Its totient is φ = 2617596.

The previous prime is 3926357. The next prime is 3926423. The reversal of 3926421 is 1246293.

It is not a de Polignac number, because 3926421 - 2⁶ = 3926357 is a prime.

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: 145423 = 3926421 / (3 + 9 + 2 + 6 + 4 + 2 + 1).

It is a d-powerful number, because it can be written as 3⁷ + 9 + 2¹⁷ + 6⁸ + 4⁷ + 2²¹ + 1 .

It is a Duffinian number.

3926421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3926423) 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, 72685 + ... + 72738.

It is an arithmetic number, because the mean of its divisors is an integer number (727120).

Almost surely, 2^3926421 is an apocalyptic number.

It is an amenable number.

3926421 is a deficient number, since it is larger than the sum of its proper divisors (1890539).

3926421 is a wasteful number, since it uses less digits than its factorization.

3926421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145432 (or 145426 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 3926421 is about 1981.5198712100. The cubic root of 3926421 is about 157.7607472232.

The spelling of 3926421 in words is "three million, nine hundred twenty-six thousand, four hundred twenty-one".