7402021 has 16 divisors (see below), whose sum is σ = 8926848. Its totient is φ = 6054400.

The previous prime is 7402009. The next prime is 7402037. The reversal of 7402021 is 1202047.

It is a de Polignac number, because none of the positive numbers 2^k-7402021 is a prime.

It is an Ulam number.

It is a Duffinian number.

7402021 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7401986 and 7402004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7402051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3441 + ... + 5161.

It is an arithmetic number, because the mean of its divisors is an integer number (557928).

Almost surely, 2^7402021 is an apocalyptic number.

7402021 is the 1721-st heptagonal number.

It is an amenable number.

7402021 is a deficient number, since it is larger than the sum of its proper divisors (1524827).

7402021 is a wasteful number, since it uses less digits than its factorization.

7402021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1772.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 7402021 is about 2720.6655435757. The cubic root of 7402021 is about 194.8872545710.

Adding to 7402021 its reverse (1202047), we get a palindrome (8604068).

The spelling of 7402021 in words is "seven million, four hundred two thousand, twenty-one".