4021902 has 12 divisors (see below), whose sum is σ = 8714160. Its totient is φ = 1340628.

The previous prime is 4021891. The next prime is 4021903. The reversal of 4021902 is 2091204.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 223439 = 4021902 / (4 + 0 + 2 + 1 + 9 + 0 + 2).

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111702 + ... + 111737.

It is an arithmetic number, because the mean of its divisors is an integer number (726180).

Almost surely, 2^4021902 is an apocalyptic number.

4021902 is an abundant number, since it is smaller than the sum of its proper divisors (4692258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4021902 is a wasteful number, since it uses less digits than its factorization.

4021902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223447 (or 223444 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 4021902 is about 2005.4680251752. The cubic root of 4021902 is about 159.0293051479.

It can be divided in two parts, 402 and 1902, that added together give a square (2304 = 48²).

The spelling of 4021902 in words is "four million, twenty-one thousand, nine hundred two".