7400921 has 4 divisors (see below), whose sum is σ = 8073744. Its totient is φ = 6728100.

The previous prime is 7400903. The next prime is 7400923. The reversal of 7400921 is 1290047.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7400921 - 2¹⁰ = 7399897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7400923) 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, 336395 + ... + 336416.

It is an arithmetic number, because the mean of its divisors is an integer number (2018436).

Almost surely, 2^7400921 is an apocalyptic number.

It is an amenable number.

7400921 is a deficient number, since it is larger than the sum of its proper divisors (672823).

7400921 is a wasteful number, since it uses less digits than its factorization.

7400921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 672822.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 7400921 is about 2720.4633796469. The cubic root of 7400921 is about 194.8776001536.

Adding to 7400921 its reverse (1290047), we get a palindrome (8690968).

The spelling of 7400921 in words is "seven million, four hundred thousand, nine hundred twenty-one".