2499999386 has 4 divisors (see below), whose sum is σ = 3749999082. Its totient is φ = 1249999692.

The previous prime is 2499999377. The next prime is 2499999401. The reversal of 2499999386 is 6839999942.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6839999942 = 2 ⋅3419999971.

It can be written as a sum of positive squares in only one way, i.e., 1328238025 + 1171761361 = 36445^2 + 34231^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 624999845 + ... + 624999848.

Almost surely, 2^2499999386 is an apocalyptic number.

2499999386 is a deficient number, since it is larger than the sum of its proper divisors (1249999696).

2499999386 is a wasteful number, since it uses less digits than its factorization.

2499999386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249999695.

The product of its digits is 68024448, while the sum is 68.

The square root of 2499999386 is about 49999.9938599996. The cubic root of 2499999386 is about 1357.2086971873.

The spelling of 2499999386 in words is "two billion, four hundred ninety-nine million, nine hundred ninety-nine thousand, three hundred eighty-six".