1490157778 has 4 divisors (see below), whose sum is σ = 2235236670. Its totient is φ = 745078888.

The previous prime is 1490157769. The next prime is 1490157811. The reversal of 1490157778 is 8777510941.

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

It can be written as a sum of positive squares in only one way, i.e., 771006289 + 719151489 = 27767^2 + 26817^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372539443 + ... + 372539446.

Almost surely, 2^1490157778 is an apocalyptic number.

1490157778 is a deficient number, since it is larger than the sum of its proper divisors (745078892).

1490157778 is an equidigital number, since it uses as much as digits as its factorization.

1490157778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745078891.

The product of its (nonzero) digits is 493920, while the sum is 49.

The square root of 1490157778 is about 38602.5618061807. The cubic root of 1490157778 is about 1142.2050728567.

The spelling of 1490157778 in words is "one billion, four hundred ninety million, one hundred fifty-seven thousand, seven hundred seventy-eight".