1551942478 has 16 divisors (see below), whose sum is σ = 2498618880. Its totient is φ = 720320256.

The previous prime is 1551942451. The next prime is 1551942499. The reversal of 1551942478 is 8742491551.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 310158 + ... + 315121.

It is an arithmetic number, because the mean of its divisors is an integer number (156163680).

Almost surely, 2^1551942478 is an apocalyptic number.

1551942478 is a deficient number, since it is larger than the sum of its proper divisors (946676402).

1551942478 is a wasteful number, since it uses less digits than its factorization.

1551942478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625371.

The product of its digits is 403200, while the sum is 46.

The square root of 1551942478 is about 39394.7011411433. The cubic root of 1551942478 is about 1157.7777704308. Note that the first 5 decimals are identical.

The spelling of 1551942478 in words is "one billion, five hundred fifty-one million, nine hundred forty-two thousand, four hundred seventy-eight".