1681407478 has 8 divisors (see below), whose sum is σ = 2559754872. Its totient is φ = 828155856.

The previous prime is 1681407461. The next prime is 1681407487. The reversal of 1681407478 is 8747041861.

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

It is a super-2 number, since 2×1681407478² = 5654262214148640968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6273775 + ... + 6274042.

It is an arithmetic number, because the mean of its divisors is an integer number (319969359).

Almost surely, 2^1681407478 is an apocalyptic number.

1681407478 is a deficient number, since it is larger than the sum of its proper divisors (878347394).

1681407478 is a wasteful number, since it uses less digits than its factorization.

1681407478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12547886.

The product of its (nonzero) digits is 301056, while the sum is 46.

The square root of 1681407478 is about 41004.9689428001. The cubic root of 1681407478 is about 1189.1162796076.

The spelling of 1681407478 in words is "one billion, six hundred eighty-one million, four hundred seven thousand, four hundred seventy-eight".