1155905646 has 16 divisors (see below), whose sum is σ = 2642070144. Its totient is φ = 330258744.

The previous prime is 1155905627. The next prime is 1155905659. The reversal of 1155905646 is 6465095511.

It is a super-2 number, since 2×1155905646² = 2672235724909354632, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 27521563 = 1155905646 / (1 + 1 + 5 + 5 + 9 + 0 + 5 + 6 + 4 + 6).

It is a junction number, because it is equal to n+sod(n) for n = 1155905598 and 1155905607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13760740 + ... + 13760823.

It is an arithmetic number, because the mean of its divisors is an integer number (165129384).

Almost surely, 2^1155905646 is an apocalyptic number.

1155905646 is an abundant number, since it is smaller than the sum of its proper divisors (1486164498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1155905646 is a wasteful number, since it uses less digits than its factorization.

1155905646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27521575.

The product of its (nonzero) digits is 162000, while the sum is 42.

The square root of 1155905646 is about 33998.6124128618. The cubic root of 1155905646 is about 1049.4799075065.

The spelling of 1155905646 in words is "one billion, one hundred fifty-five million, nine hundred five thousand, six hundred forty-six".