1187961828 has 12 divisors (see below), whose sum is σ = 2771910960. Its totient is φ = 395987272.

The previous prime is 1187961823. The next prime is 1187961869. The reversal of 1187961828 is 8281697811.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1187961828² = 2822506609570203168, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1187961821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49498398 + ... + 49498421.

It is an arithmetic number, because the mean of its divisors is an integer number (230992580).

Almost surely, 2^1187961828 is an apocalyptic number.

It is an amenable number.

1187961828 is an abundant number, since it is smaller than the sum of its proper divisors (1583949132).

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

1187961828 is a wasteful number, since it uses less digits than its factorization.

1187961828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98996826 (or 98996824 counting only the distinct ones).

The product of its digits is 387072, while the sum is 51.

The square root of 1187961828 is about 34466.8221337564. The cubic root of 1187961828 is about 1059.0931570035.

The spelling of 1187961828 in words is "one billion, one hundred eighty-seven million, nine hundred sixty-one thousand, eight hundred twenty-eight".