619977943 has 4 divisors (see below), whose sum is σ = 667668568. Its totient is φ = 572287320.

The previous prime is 619977907. The next prime is 619977973. The reversal of 619977943 is 349779916.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 619977943 - 2¹³ = 619969751 is a prime.

It is a super-2 number, since 2×619977943² = 768745299613022498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (619977973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23845293 + ... + 23845318.

It is an arithmetic number, because the mean of its divisors is an integer number (166917142).

Almost surely, 2^619977943 is an apocalyptic number.

619977943 is a deficient number, since it is larger than the sum of its proper divisors (47690625).

619977943 is a wasteful number, since it uses less digits than its factorization.

619977943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47690624.

The product of its digits is 2571912, while the sum is 55.

The square root of 619977943 is about 24899.3562768197. The cubic root of 619977943 is about 852.6917863557.

The spelling of 619977943 in words is "six hundred nineteen million, nine hundred seventy-seven thousand, nine hundred forty-three".