1972869890 has 32 divisors (see below), whose sum is σ = 3765034224. Its totient is φ = 741744640.

The previous prime is 1972869851. The next prime is 1972869893. The reversal of 1972869890 is 989682791.

It is a Cunningham number, because it is equal to 44417²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 1535934481 + 436935409 = 39191^2 + 20903^2 .

It is a super-2 number, since 2×1972869890² = 7784431205737224200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1972869893) 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, 128210 + ... + 142770.

Almost surely, 2^1972869890 is an apocalyptic number.

1972869890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1972869890 is a deficient number, since it is larger than the sum of its proper divisors (1792164334).

1972869890 is a wasteful number, since it uses less digits than its factorization.

1972869890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15382.

The product of its (nonzero) digits is 3919104, while the sum is 59.

The square root of 1972869890 is about 44417.0000112570. Note that the first 4 decimals coincide. The cubic root of 1972869890 is about 1254.1981279928.

The spelling of 1972869890 in words is "one billion, nine hundred seventy-two million, eight hundred sixty-nine thousand, eight hundred ninety".