19139461 has 4 divisors (see below), whose sum is σ = 20879424. Its totient is φ = 17399500.

The previous prime is 19139459. The next prime is 19139489. The reversal of 19139461 is 16493191.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 19139461 - 2¹ = 19139459 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 (19133461) 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, 869965 + ... + 869986.

It is an arithmetic number, because the mean of its divisors is an integer number (5219856).

Almost surely, 2^19139461 is an apocalyptic number.

19139461 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19139461 is the 1957-th centered decagonal number.

It is an amenable number.

19139461 is a deficient number, since it is larger than the sum of its proper divisors (1739963).

19139461 is a wasteful number, since it uses less digits than its factorization.

19139461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1739962.

The product of its digits is 5832, while the sum is 34.

The square root of 19139461 is about 4374.8669694060. The cubic root of 19139461 is about 267.4914475968.

It can be divided in two parts, 19139 and 461, that added together give a square (19600 = 140²).

The spelling of 19139461 in words is "nineteen million, one hundred thirty-nine thousand, four hundred sixty-one".