120645403 has 4 divisors (see below), whose sum is σ = 122172640. Its totient is φ = 119118168.

The previous prime is 120645391. The next prime is 120645407. The reversal of 120645403 is 304546021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 120645403 - 2⁹ = 120644891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120645407) 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, 763500 + ... + 763657.

It is an arithmetic number, because the mean of its divisors is an integer number (30543160).

Almost surely, 2^120645403 is an apocalyptic number.

120645403 is a deficient number, since it is larger than the sum of its proper divisors (1527237).

120645403 is an equidigital number, since it uses as much as digits as its factorization.

120645403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527236.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 120645403 is about 10983.8701285112. The cubic root of 120645403 is about 494.1251124153.

The spelling of 120645403 in words is "one hundred twenty million, six hundred forty-five thousand, four hundred three".