1611993940 has 48 divisors (see below), whose sum is σ = 3497800320. Its totient is φ = 623692160.

The previous prime is 1611993919. The next prime is 1611993961. The reversal of 1611993940 is 493991161.

It is an interprime number because it is at equal distance from previous prime (1611993919) and next prime (1611993961).

It is a congruent number.

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 in 15 ways as a sum of consecutive naturals, for example, 64551 + ... + 85969.

It is an arithmetic number, because the mean of its divisors is an integer number (72870840).

Almost surely, 2^1611993940 is an apocalyptic number.

1611993940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1611993940 is an abundant number, since it is smaller than the sum of its proper divisors (1885806380).

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

1611993940 is a wasteful number, since it uses less digits than its factorization.

1611993940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21552 (or 21550 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 1611993940 is about 40149.6443321731. The cubic root of 1611993940 is about 1172.5223639926.

The spelling of 1611993940 in words is "one billion, six hundred eleven million, nine hundred ninety-three thousand, nine hundred forty".