1378631590 has 32 divisors (see below), whose sum is σ = 2841687360. Its totient is φ = 471732864.

The previous prime is 1378631567. The next prime is 1378631599. The reversal of 1378631590 is 951368731.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378631599) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16284 + ... + 54976.

It is an arithmetic number, because the mean of its divisors is an integer number (88802730).

Almost surely, 2^1378631590 is an apocalyptic number.

1378631590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1378631590 is an abundant number, since it is smaller than the sum of its proper divisors (1463055770).

1378631590 is a wasteful number, since it uses less digits than its factorization.

1378631590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39216.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 1378631590 is about 37129.9284944100. The cubic root of 1378631590 is about 1112.9681645289.

The spelling of 1378631590 in words is "one billion, three hundred seventy-eight million, six hundred thirty-one thousand, five hundred ninety".