8121402 has 24 divisors (see below), whose sum is σ = 17930484. Its totient is φ = 2655744.

The previous prime is 8121401. The next prime is 8121419. The reversal of 8121402 is 2041218.

It can be written as a sum of positive squares in 2 ways, for example, as 6702921 + 1418481 = 2589^2 + 1191^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (8121401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3303 + ... + 5210.

Almost surely, 2^8121402 is an apocalyptic number.

8121402 is an abundant number, since it is smaller than the sum of its proper divisors (9809082).

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

8121402 is a wasteful number, since it uses less digits than its factorization.

8121402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8574 (or 8571 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 8121402 is about 2849.8073619106. The cubic root of 8121402 is about 201.0066085300.

The spelling of 8121402 in words is "eight million, one hundred twenty-one thousand, four hundred two".