1387007997 has 4 divisors (see below), whose sum is σ = 1849344000. Its totient is φ = 924671996.

The previous prime is 1387007981. The next prime is 1387008001. The reversal of 1387007997 is 7997007831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1387007997 - 2⁴ = 1387007981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387007497) 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, 231167997 + ... + 231168002.

It is an arithmetic number, because the mean of its divisors is an integer number (462336000).

Almost surely, 2^1387007997 is an apocalyptic number.

It is an amenable number.

1387007997 is a deficient number, since it is larger than the sum of its proper divisors (462336003).

1387007997 is an equidigital number, since it uses as much as digits as its factorization.

1387007997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462336002.

The product of its (nonzero) digits is 666792, while the sum is 51.

The square root of 1387007997 is about 37242.5562629635. The cubic root of 1387007997 is about 1115.2177035409.

The spelling of 1387007997 in words is "one billion, three hundred eighty-seven million, seven thousand, nine hundred ninety-seven".