1538690477 has 4 divisors (see below), whose sum is σ = 1538770176. Its totient is φ = 1538610780.

The previous prime is 1538690449. The next prime is 1538690479. The reversal of 1538690477 is 7740968351.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7740968351 = 101 ⋅76643251.

It is a cyclic number.

It is not a de Polignac number, because 1538690477 - 2⁸ = 1538690221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1538690479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9398 + ... + 56264.

It is an arithmetic number, because the mean of its divisors is an integer number (384692544).

Almost surely, 2^1538690477 is an apocalyptic number.

It is an amenable number.

1538690477 is a deficient number, since it is larger than the sum of its proper divisors (79699).

1538690477 is an equidigital number, since it uses as much as digits as its factorization.

1538690477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79698.

The product of its (nonzero) digits is 1270080, while the sum is 50.

The square root of 1538690477 is about 39226.1453242605. The cubic root of 1538690477 is about 1154.4729333088.

The spelling of 1538690477 in words is "one billion, five hundred thirty-eight million, six hundred ninety thousand, four hundred seventy-seven".