1987545407 has 4 divisors (see below), whose sum is σ = 2092153080. Its totient is φ = 1882937736.

The previous prime is 1987545379. The next prime is 1987545409. The reversal of 1987545407 is 7045457891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7045457891 = 8431 ⋅835661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1987545407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1987545409) 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, 52303808 + ... + 52303845.

It is an arithmetic number, because the mean of its divisors is an integer number (523038270).

Almost surely, 2^1987545407 is an apocalyptic number.

1987545407 is a deficient number, since it is larger than the sum of its proper divisors (104607673).

1987545407 is a wasteful number, since it uses less digits than its factorization.

1987545407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104607672.

The product of its (nonzero) digits is 1411200, while the sum is 50.

The square root of 1987545407 is about 44581.8955070329. The cubic root of 1987545407 is about 1257.3003016362.

The spelling of 1987545407 in words is "one billion, nine hundred eighty-seven million, five hundred forty-five thousand, four hundred seven".