7426921 has 4 divisors (see below), whose sum is σ = 7445844. Its totient is φ = 7408000.

The previous prime is 7426901. The next prime is 7426931. The reversal of 7426921 is 1296247.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1296247 = 71 ⋅18257.

It can be written as a sum of positive squares in 2 ways, for example, as 7371225 + 55696 = 2715^2 + 236^2 .

It is a cyclic number.

It is not a de Polignac number, because 7426921 - 2¹³ = 7418729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7426901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8860 + ... + 9661.

It is an arithmetic number, because the mean of its divisors is an integer number (1861461).

Almost surely, 2^7426921 is an apocalyptic number.

It is an amenable number.

7426921 is a deficient number, since it is larger than the sum of its proper divisors (18923).

7426921 is a wasteful number, since it uses less digits than its factorization.

7426921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18922.

The product of its digits is 6048, while the sum is 31.

The square root of 7426921 is about 2725.2377877903. The cubic root of 7426921 is about 195.1055400630.

The spelling of 7426921 in words is "seven million, four hundred twenty-six thousand, nine hundred twenty-one".