1987022406 has 32 divisors (see below), whose sum is σ = 4126348800. Its totient is φ = 637126560.

The previous prime is 1987022393. The next prime is 1987022419. The reversal of 1987022406 is 6042207891.

It is an interprime number because it is at equal distance from previous prime (1987022393) and next prime (1987022419).

It is a super-4 number, since 4×1987022406⁴ (a number of 38 digits) contains 4444 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26085 + ... + 68223.

It is an arithmetic number, because the mean of its divisors is an integer number (128948400).

Almost surely, 2^1987022406 is an apocalyptic number.

1987022406 is an abundant number, since it is smaller than the sum of its proper divisors (2139326394).

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

1987022406 is a wasteful number, since it uses less digits than its factorization.

1987022406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42444.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 1987022406 is about 44576.0295001697. The cubic root of 1987022406 is about 1257.1900103194.

The spelling of 1987022406 in words is "one billion, nine hundred eighty-seven million, twenty-two thousand, four hundred six".