7428203906 has 4 divisors (see below), whose sum is σ = 11142305862. Its totient is φ = 3714101952.

The previous prime is 7428203897. The next prime is 7428203933. The reversal of 7428203906 is 6093028247.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 7403053681 + 25150225 = 86041^2 + 5015^2 .

It is a super-2 number, since 2×7428203906² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1857050975 + ... + 1857050978.

Almost surely, 2^7428203906 is an apocalyptic number.

7428203906 is a deficient number, since it is larger than the sum of its proper divisors (3714101956).

7428203906 is a wasteful number, since it uses less digits than its factorization.

7428203906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3714101955.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 7428203906 is about 86187.0286412056. The cubic root of 7428203906 is about 1951.1677341512.

The spelling of 7428203906 in words is "seven billion, four hundred twenty-eight million, two hundred three thousand, nine hundred six".