1421683987 has 4 divisors (see below), whose sum is σ = 1496509480. Its totient is φ = 1346858496.

The previous prime is 1421683951. The next prime is 1421683993. The reversal of 1421683987 is 7893861241.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1421683987 - 2¹¹ = 1421681939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1421683987.

It is not an unprimeable number, because it can be changed into a prime (1421683927) 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, 37412718 + ... + 37412755.

It is an arithmetic number, because the mean of its divisors is an integer number (374127370).

Almost surely, 2^1421683987 is an apocalyptic number.

1421683987 is a deficient number, since it is larger than the sum of its proper divisors (74825493).

1421683987 is an equidigital number, since it uses as much as digits as its factorization.

1421683987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74825492.

The product of its digits is 580608, while the sum is 49.

The square root of 1421683987 is about 37705.2249297097. The cubic root of 1421683987 is about 1124.4350050542.

The spelling of 1421683987 in words is "one billion, four hundred twenty-one million, six hundred eighty-three thousand, nine hundred eighty-seven".