1220142987 has 32 divisors (see below), whose sum is σ = 2068200960. Its totient is φ = 696431520.

The previous prime is 1220142977. The next prime is 1220142997. The reversal of 1220142987 is 7892410221.

1220142987 is a `hidden beast` number, since 1 + 220 + 1 + 429 + 8 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (1220142977) and next prime (1220142997).

It is not a de Polignac number, because 1220142987 - 2⁸ = 1220142731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220142977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 189808 + ... + 196130.

It is an arithmetic number, because the mean of its divisors is an integer number (64631280).

Almost surely, 2^1220142987 is an apocalyptic number.

1220142987 is a deficient number, since it is larger than the sum of its proper divisors (848057973).

1220142987 is a wasteful number, since it uses less digits than its factorization.

1220142987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7360 (or 7354 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1220142987 is about 34930.5451861261. The cubic root of 1220142987 is about 1068.5714732888.

The spelling of 1220142987 in words is "one billion, two hundred twenty million, one hundred forty-two thousand, nine hundred eighty-seven".