1638264741 has 16 divisors (see below), whose sum is σ = 2246356800. Its totient is φ = 1061591168.

The previous prime is 1638264737. The next prime is 1638264751. The reversal of 1638264741 is 1474628361.

It is a cyclic number.

It is not a de Polignac number, because 1638264741 - 2² = 1638264737 is a prime.

It is a super-2 number, since 2×1638264741² = 5367822723207594162, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1638264693 and 1638264702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638264751) 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, 36246 + ... + 67751.

It is an arithmetic number, because the mean of its divisors is an integer number (140397300).

Almost surely, 2^1638264741 is an apocalyptic number.

It is an amenable number.

1638264741 is a deficient number, since it is larger than the sum of its proper divisors (608092059).

1638264741 is a wasteful number, since it uses less digits than its factorization.

1638264741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104148.

The product of its digits is 193536, while the sum is 42.

The square root of 1638264741 is about 40475.4832089748. The cubic root of 1638264741 is about 1178.8576373690.

The spelling of 1638264741 in words is "one billion, six hundred thirty-eight million, two hundred sixty-four thousand, seven hundred forty-one".