1278435416 has 8 divisors (see below), whose sum is σ = 2397066420. Its totient is φ = 639217704.

The previous prime is 1278435409. The next prime is 1278435421. The reversal of 1278435416 is 6145348721.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1278435416² = 3268794225766186112, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79902206 + ... + 79902221.

Almost surely, 2^1278435416 is an apocalyptic number.

It is an amenable number.

1278435416 is a deficient number, since it is larger than the sum of its proper divisors (1118631004).

1278435416 is a wasteful number, since it uses less digits than its factorization.

1278435416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159804433 (or 159804429 counting only the distinct ones).

The product of its digits is 161280, while the sum is 41.

The square root of 1278435416 is about 35755.2152279916. The cubic root of 1278435416 is about 1085.3244772697.

The spelling of 1278435416 in words is "one billion, two hundred seventy-eight million, four hundred thirty-five thousand, four hundred sixteen".