1215890428 has 6 divisors (see below), whose sum is σ = 2127808256. Its totient is φ = 607945212.

The previous prime is 1215890359. The next prime is 1215890447. The reversal of 1215890428 is 8240985121.

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, 151986300 + ... + 151986307.

Almost surely, 2^1215890428 is an apocalyptic number.

It is an amenable number.

1215890428 is a deficient number, since it is larger than the sum of its proper divisors (911917828).

1215890428 is a wasteful number, since it uses less digits than its factorization.

1215890428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303972611 (or 303972609 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 1215890428 is about 34869.6204166320. The cubic root of 1215890428 is about 1067.3285990844.

The spelling of 1215890428 in words is "one billion, two hundred fifteen million, eight hundred ninety thousand, four hundred twenty-eight".