123478402 has 8 divisors (see below), whose sum is σ = 185287500. Its totient is φ = 61715904.

The previous prime is 123478391. The next prime is 123478423. The reversal of 123478402 is 204874321.

It can be written as a sum of positive squares in 2 ways, for example, as 110439081 + 13039321 = 10509^2 + 3611^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4027 + ... + 16222.

Almost surely, 2^123478402 is an apocalyptic number.

123478402 is a deficient number, since it is larger than the sum of its proper divisors (61809098).

123478402 is a wasteful number, since it uses less digits than its factorization.

123478402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23300.

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 123478402 is about 11112.0836029972. The cubic root of 123478402 is about 497.9629145031.

The spelling of 123478402 in words is "one hundred twenty-three million, four hundred seventy-eight thousand, four hundred two".