1999677140 has 24 divisors (see below), whose sum is σ = 4222530312. Its totient is φ = 795450240.

The previous prime is 1999677137. The next prime is 1999677143. The reversal of 1999677140 is 417769991.

It is an interprime number because it is at equal distance from previous prime (1999677137) and next prime (1999677143).

It can be written as a sum of positive squares in 4 ways, for example, as 178436164 + 1821240976 = 13358^2 + 42676^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999677143) 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, 272579 + ... + 279818.

It is an arithmetic number, because the mean of its divisors is an integer number (175938763).

Almost surely, 2^1999677140 is an apocalyptic number.

1999677140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1999677140 is an abundant number, since it is smaller than the sum of its proper divisors (2222853172).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1999677140 is a wasteful number, since it uses less digits than its factorization.

1999677140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552587 (or 552585 counting only the distinct ones).

The product of its (nonzero) digits is 857304, while the sum is 53.

The square root of 1999677140 is about 44717.7497197701. The cubic root of 1999677140 is about 1259.8532498947.

The spelling of 1999677140 in words is "one billion, nine hundred ninety-nine million, six hundred seventy-seven thousand, one hundred forty".