1987954039 has 4 divisors (see below), whose sum is σ = 1988287456. Its totient is φ = 1987620624.

The previous prime is 1987953959. The next prime is 1987954069. The reversal of 1987954039 is 9304597891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9304597891 = 59 ⋅157705049.

It is a cyclic number.

It is not a de Polignac number, because 1987954039 - 2²³ = 1979565431 is a prime.

It is a super-2 number, since 2×1987954039² = 7903922522352827042, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987954069) 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, 157599 + ... + 169744.

It is an arithmetic number, because the mean of its divisors is an integer number (497071864).

Almost surely, 2^1987954039 is an apocalyptic number.

1987954039 is a deficient number, since it is larger than the sum of its proper divisors (333417).

1987954039 is an equidigital number, since it uses as much as digits as its factorization.

1987954039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333416.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The square root of 1987954039 is about 44586.4782080846. The cubic root of 1987954039 is about 1257.3864611657.

The spelling of 1987954039 in words is "one billion, nine hundred eighty-seven million, nine hundred fifty-four thousand, thirty-nine".