1215738428 has 6 divisors (see below), whose sum is σ = 2127542256. Its totient is φ = 607869212.

The previous prime is 1215738421. The next prime is 1215738431. The reversal of 1215738428 is 8248375121.

It is a super-2 number, since 2×1215738428² = 2956039850631822368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215738421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151967300 + ... + 151967307.

It is an arithmetic number, because the mean of its divisors is an integer number (354590376).

Almost surely, 2^1215738428 is an apocalyptic number.

It is an amenable number.

1215738428 is a deficient number, since it is larger than the sum of its proper divisors (911803828).

1215738428 is a wasteful number, since it uses less digits than its factorization.

1215738428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303934611 (or 303934609 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The square root of 1215738428 is about 34867.4408008388. The cubic root of 1215738428 is about 1067.2841211983.

The spelling of 1215738428 in words is "one billion, two hundred fifteen million, seven hundred thirty-eight thousand, four hundred twenty-eight".