1155581428 has 12 divisors (see below), whose sum is σ = 2052451072. Its totient is φ = 569166840.

The previous prime is 1155581417. The next prime is 1155581431. The reversal of 1155581428 is 8241855511.

It is a happy number.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2155668 + ... + 2156203.

Almost surely, 2^1155581428 is an apocalyptic number.

It is an amenable number.

1155581428 is a deficient number, since it is larger than the sum of its proper divisors (896869644).

1155581428 is a wasteful number, since it uses less digits than its factorization.

1155581428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4311942 (or 4311940 counting only the distinct ones).

The product of its digits is 64000, while the sum is 40.

The square root of 1155581428 is about 33993.8439721077. The cubic root of 1155581428 is about 1049.3817760555.

The spelling of 1155581428 in words is "one billion, one hundred fifty-five million, five hundred eighty-one thousand, four hundred twenty-eight".