1387599049 has 4 divisors (see below), whose sum is σ = 1425101764. Its totient is φ = 1350096336.

The previous prime is 1387599023. The next prime is 1387599061. The reversal of 1387599049 is 9409957831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9409957831 = 1453 ⋅6476227.

It can be written as a sum of positive squares in 2 ways, for example, as 1329915024 + 57684025 = 36468^2 + 7595^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387599049 - 2⁷ = 1387598921 is a prime.

It is a super-2 number, since 2×1387599049² = 3850862241571408802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1387599149) 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, 18751302 + ... + 18751375.

It is an arithmetic number, because the mean of its divisors is an integer number (356275441).

Almost surely, 2^1387599049 is an apocalyptic number.

It is an amenable number.

1387599049 is a deficient number, since it is larger than the sum of its proper divisors (37502715).

1387599049 is an equidigital number, since it uses as much as digits as its factorization.

1387599049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37502714.

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

The square root of 1387599049 is about 37250.4905873735. The cubic root of 1387599049 is about 1115.3760919685.

The spelling of 1387599049 in words is "one billion, three hundred eighty-seven million, five hundred ninety-nine thousand, forty-nine".