1952987639 has 4 divisors (see below), whose sum is σ = 1953132024. Its totient is φ = 1952843256.

The previous prime is 1952987587. The next prime is 1952987653. The reversal of 1952987639 is 9367892591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9367892591 = 29 ⋅323030779.

It is a cyclic number.

It is not a de Polignac number, because 1952987639 - 2²⁰ = 1951939063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1952987689) 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, 49532 + ... + 79745.

It is an arithmetic number, because the mean of its divisors is an integer number (488283006).

Almost surely, 2^1952987639 is an apocalyptic number.

1952987639 is a deficient number, since it is larger than the sum of its proper divisors (144385).

1952987639 is a wasteful number, since it uses less digits than its factorization.

1952987639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144384.

The product of its digits is 7348320, while the sum is 59.

The square root of 1952987639 is about 44192.6197345213. The cubic root of 1952987639 is about 1249.9706956330.

The spelling of 1952987639 in words is "one billion, nine hundred fifty-two million, nine hundred eighty-seven thousand, six hundred thirty-nine".