7236921 has 16 divisors (see below), whose sum is σ = 10056960. Its totient is φ = 4623360.

The previous prime is 7236899. The next prime is 7236937. The reversal of 7236921 is 1296327.

It is not a de Polignac number, because 7236921 - 2¹³ = 7228729 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (7236961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16576 + ... + 17006.

It is an arithmetic number, because the mean of its divisors is an integer number (628560).

Almost surely, 2^7236921 is an apocalyptic number.

It is an amenable number.

7236921 is a deficient number, since it is larger than the sum of its proper divisors (2820039).

7236921 is a wasteful number, since it uses less digits than its factorization.

7236921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656.

The product of its digits is 4536, while the sum is 30.

The square root of 7236921 is about 2690.1525979022. The cubic root of 7236921 is about 193.4273776177.

It can be divided in two parts, 72369 and 21, that added together give a triangular number (72390 = T₃₈₀).

The spelling of 7236921 in words is "seven million, two hundred thirty-six thousand, nine hundred twenty-one".