1945015690 has 16 divisors (see below), whose sum is σ = 3501717480. Its totient is φ = 777853120.

The previous prime is 1945015669. The next prime is 1945015691. The reversal of 1945015690 is 965105491.

It can be written as a sum of positive squares in 4 ways, for example, as 1594165329 + 350850361 = 39927^2 + 18731^2 .

It is a super-2 number, since 2×1945015690² = 7566172068692352200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1945015691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44160 + ... + 76420.

Almost surely, 2^1945015690 is an apocalyptic number.

1945015690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1945015690 is a deficient number, since it is larger than the sum of its proper divisors (1556701790).

1945015690 is a wasteful number, since it uses less digits than its factorization.

1945015690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38297.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 1945015690 is about 44102.3320245086. The cubic root of 1945015690 is about 1248.2676140470.

The spelling of 1945015690 in words is "one billion, nine hundred forty-five million, fifteen thousand, six hundred ninety".